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Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Grade 12 MCQ


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15 Questions MCQ Test - Case Based Questions Test: Ray Optics & Optical Instruments - 1

Case Based Questions Test: Ray Optics & Optical Instruments - 1 for Grade 12 2024 is part of Grade 12 preparation. The Case Based Questions Test: Ray Optics & Optical Instruments - 1 questions and answers have been prepared according to the Grade 12 exam syllabus.The Case Based Questions Test: Ray Optics & Optical Instruments - 1 MCQs are made for Grade 12 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Case Based Questions Test: Ray Optics & Optical Instruments - 1 below.
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Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 1

Read the following text and answer the following questions on the basis of the same:

Sparking Brilliance of Diamond: The total internal reflection of the light is used in polishing diamonds to create a sparking brilliance.

By polishing the diamond with specific cuts, it is adjusted the most of the light rays approaching the surface are incident with an angle of incidence more than critical angle. Hence, they suffer multiple reflections and ultimately come out of diamond from the top. This gives the diamond a sparking brilliance.

Q. The critical angle for a diamond is 24.4°. Then its refractive index is:

Detailed Solution for Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 1
Refractive index = 1/ sin

C = critical angle = 24.4

∴ µ = 1/sin 24.4 = 1/0.4131 = 2.42

Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 2

Read the following text and answer the following questions on the basis of the same:

Sparking Brilliance of Diamond: The total internal reflection of the light is used in polishing diamonds to create a sparking brilliance.

By polishing the diamond with specific cuts, it is adjusted the most of the light rays approaching the surface are incident with an angle of incidence more than critical angle. Hence, they suffer multiple reflections and ultimately come out of diamond from the top. This gives the diamond a sparking brilliance.

Q. A diamond is immersed in a liquid with a refractive index greater than water. Then the critical angle for total internal reflection will:

Detailed Solution for Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 2
A diamond is immersed in a liquid with a refractive index greater than water. Then the critical angle for total internal reflection will increase.

This is because, as the refractive index of outer medium increases, the refracted ray bends less away from normal. So, angle of incidence should increase more to achieve 90° angle of refraction.

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Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 3

Read the following text and answer the following questions on the basis of the same:

Sparking Brilliance of Diamond: The total internal reflection of the light is used in polishing diamonds to create a sparking brilliance.

By polishing the diamond with specific cuts, it is adjusted the most of the light rays approaching the surface are incident with an angle of incidence more than critical angle. Hence, they suffer multiple reflections and ultimately come out of diamond from the top. This gives the diamond a sparking brilliance.

Q. Light cannot easily escape a diamond without multiple internal reflections. This is because:

Detailed Solution for Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 3
Light cannot easily escape a diamond, because its critical angle with air is too small. Most of the reflections are total and it is cut so that light can exit only in particular direction —thus light is concentrated inside and making the diamond sparkle.
Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 4

Read the following text and answer the following questions on the basis of the same:

Sparking Brilliance of Diamond: The total internal reflection of the light is used in polishing diamonds to create a sparking brilliance.

By polishing the diamond with specific cuts, it is adjusted the most of the light rays approaching the surface are incident with an angle of incidence more than critical angle. Hence, they suffer multiple reflections and ultimately come out of diamond from the top. This gives the diamond a sparking brilliance.

Q. The basic reason for the extraordinary sparkle of suitably cut diamond is that:

Detailed Solution for Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 4
The brilliance of diamond is due to its too small critical angle with air. As the critical angle become smaller, value of sine of critical angle also become small and hence refractive index increases (since μ= 1/sinC). So, the basic reason for the extraordinary sparkle of suitably cut diamond is its high refractive index.
Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 5

Read the following text and answer the following questions on the basis of the same:

Sparking Brilliance of Diamond: The total internal reflection of the light is used in polishing diamonds to create a sparking brilliance.

By polishing the diamond with specific cuts, it is adjusted the most of the light rays approaching the surface are incident with an angle of incidence more than critical angle. Hence, they suffer multiple reflections and ultimately come out of diamond from the top. This gives the diamond a sparking brilliance.

Q. The following diagram shows same diamond cut in two different shapes.

The brilliance of diamond in the second diamond will be:

Detailed Solution for Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 5
The brilliance of diamond in the second diamond will be less than the first since in the second case, no total internal reflection has taken place.
Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 6

Read the following text and answer the following questions on the basis of the same:

Photometry:
The measurement of light as perceived by human eye is called photometry. Photometry is measurement of a physiological phenomenon, being the stimulus of light as received by the human eye, transmitted by the optic nerves and analysed by the brain. The main physical quantities in photometry are (i) the luminous intensity of the source, (ii) the luminous flux or flow of light from the source and (iii) illuminance of the surface. The SI unit of luminous intensity (I) is candela (cd). The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 Hz and that has a radiant intensity in that direction of 1/683 watt per steradian. If a light source emits one candela of luminous intensity into a solid angle of one steradian, the total luminous flux emitted into that solid angle is one lumen (lm). A standard 100 watt incandescent light bulb emits approximately 1700 lumens.

Q. Light received by human eye is analysed by:

Detailed Solution for Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 6

Light received by the human eye, transmitted by the optic nerves and analysed by the brain.

Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 7

Read the following text and answer the following questions on the basis of the same:

Photometry:
The measurement of light as perceived by human eye is called photometry. Photometry is measurement of a physiological phenomenon, being the stimulus of light as received by the human eye, transmitted by the optic nerves and analysed by the brain. The main physical quantities in photometry are (i) the luminous intensity of the source, (ii) the luminous flux or flow of light from the source and (iii) illuminance of the surface. The SI unit of luminous intensity (I) is candela (cd). The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 Hz and that has a radiant intensity in that direction of 1/683 watt per steradian. If a light source emits one candela of luminous intensity into a solid angle of one steradian, the total luminous flux emitted into that solid angle is one lumen (lm). A standard 100 watt incandescent light bulb emits approximately 1700 lumens.

Q. Unit of luminous flux is:

Detailed Solution for Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 7

The total luminous flux emitted into a solid angle is one lumen (lm).

Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 8

Read the following text and answer the following questions on the basis of the same:

Photometry:

The measurement of light as perceived by human eye is called photometry. Photometry is measurement of a physiological phenomenon, being the stimulus of light as received by the human eye, transmitted by the optic nerves and analysed by the brain. The main physical quantities in photometry are (i) the luminous intensity of the source, (ii) the luminous flux or flow of light from the source and (iii) illuminance of the surface. The SI unit of luminous intensity (I) is candela (cd). The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 Hz and that has a radiant intensity in that direction of 1/683 watt per steradian. If a light source emits one candela of luminous intensity into a solid angle of one steradian, the total luminous flux emitted into that solid angle is one lumen (lm). A standard 100 watt incandescent light bulb emits approximately 1700 lumens.

Q. What is photometry?

Detailed Solution for Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 8

The measurement of light as perceived by human eye is called photometry.

Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 9

Read the following text and answer the following questions on the basis of the same:

Photometry:
The measurement of light as perceived by human eye is called photometry. Photometry is measurement of a physiological phenomenon, being the stimulus of light as received by the human eye, transmitted by the optic nerves and analysed by the brain. The main physical quantities in photometry are (i) the luminous intensity of the source, (ii) the luminous flux or flow of light from the source and (iii) illuminance of the surface. The SI unit of luminous intensity (I) is candela (cd). The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 Hz and that has a radiant intensity in that direction of 1/683 watt per steradian. If a light source emits one candela of luminous intensity into a solid angle of one steradian, the total luminous flux emitted into that solid angle is one lumen (lm). A standard 100 watt incandescent light bulb emits approximately 1700 lumens.

Q. The SI unit of luminous intensity is:

Detailed Solution for Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 9

The SI unit of luminous intensity (I) is candela (cd).

Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 10

Read the following text and answer the following questions on the basis of the same:

Photometry:

The measurement of light as perceived by human eye is called photometry. Photometry is measurement of a physiological phenomenon, being the stimulus of light as received by the human eye, transmitted by the optic nerves and analysed by the brain. The main physical quantities in photometry are (i) the luminous intensity of the source, (ii) the luminous flux or flow of light from the source and (iii) illuminance of the surface. The SI unit of luminous intensity (I) is candela (cd). The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 Hz and that has a radiant intensity in that direction of 1/683 watt per steradian. If a light source emits one candela of luminous intensity into a solid angle of one steradian, the total luminous flux emitted into that solid angle is one lumen (lm). A standard 100 watt incandescent light bulb emits approximately 1700 lumens.

Q. A standard 100 watt incandescent light bulb emits approximately:

Detailed Solution for Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 10
A standard 100 watt incandescent light bulb emits approximately 1700 lumens.
Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 11

Read the following text and answer the following questions on the basis of the same:

Optical Fibre:

Optical fibre works on the principle of total internal reflection. Light rays can be used to transmit a huge amount of data, but there is a problem here – the light rays travel in straight lines. So unless we have a long straight wire without any bends at all, harnessing this advantage will be very tedious. Instead, the optical cables are designed such that they bend all the light rays’ inwards (using TIR). Light rays travel continuously, bouncing off the optical fibre walls and transmitting end to end data. It is usually made of plastic or glass.

Modes of transmission: Single-mode fibre is used for long-distance transmission, while multi- mode fiber is used for shorter distances. The outer cladding of these fibres needs better protection than metal wires. Although light signals do degrade over progressing distances due to absorption and scattering. Then, optical Regenerator system is necessary to boost the signal.

Types of Optical Fibres: The types of optical fibers depend on the refractive index, materials used, and mode of propagation of light. The classification based on the refractive index is as follows:

  • Step Index Fibres: It consists of a core surrounded by the cladding, which has a single uniform index of refraction.

  • Graded Index Fibres: The refractive index of the optical fibre decreases as the radial distance from the fibre axis increases.

Q. For long-distance transmission:

Detailed Solution for Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 11
Single-mode fibre is used for long-distance transmission, while multi-mode fibre is used for shorter distances.
Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 12

Read the following text and answer the following questions on the basis of the same:

Optical Fibre:

Optical fibre works on the principle of total internal reflection. Light rays can be used to transmit a huge amount of data, but there is a problem here – the light rays travel in straight lines. So unless we have a long straight wire without any bends at all, harnessing this advantage will be very tedious. Instead, the optical cables are designed such that they bend all the light rays’ inwards (using TIR). Light rays travel continuously, bouncing off the optical fibre walls and transmitting end to end data. It is usually made of plastic or glass.

Modes of transmission: Single-mode fibre is used for long-distance transmission, while multi- mode fiber is used for shorter distances. The outer cladding of these fibres needs better protection than metal wires. Although light signals do degrade over progressing distances due to absorption and scattering. Then, optical Regenerator system is necessary to boost the signal.

Types of Optical Fibres: The types of optical fibers depend on the refractive index, materials used, and mode of propagation of light. The classification based on the refractive index is as follows:

  • Step Index Fibres: It consists of a core surrounded by the cladding, which has a single uniform index of refraction.

  • Graded Index Fibres: The refractive index of the optical fibre decreases as the radial distance from the fibre axis increases.

Q. In graded index optical fibre:

Detailed Solution for Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 12
In graded index fibres, the refractive index of the optical fibre decreases as the radial distance from the fibre axis increases.
Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 13

Read the following text and answer the following questions on the basis of the same:

Optical Fibre:

Optical fibre works on the principle of total internal reflection. Light rays can be used to transmit a huge amount of data, but there is a problem here – the light rays travel in straight lines. So unless we have a long straight wire without any bends at all, harnessing this advantage will be very tedious. Instead, the optical cables are designed such that they bend all the light rays’ inwards (using TIR). Light rays travel continuously, bouncing off the optical fibre walls and transmitting end to end data. It is usually made of plastic or glass.

Modes of transmission: Single-mode fibre is used for long-distance transmission, while multi- mode fiber is used for shorter distances. The outer cladding of these fibres needs better protection than metal wires. Although light signals do degrade over progressing distances due to absorption and scattering. Then, optical Regenerator system is necessary to boost the signal.

Types of Optical Fibres: The types of optical fibers depend on the refractive index, materials used, and mode of propagation of light. The classification based on the refractive index is as follows:

  • Step Index Fibres: It consists of a core surrounded by the cladding, which has a single uniform index of refraction.

  • Graded Index Fibres: The refractive index of the optical fibre decreases as the radial distance from the fibre axis increases.

Q. Optical fibre works on the principle of:

Detailed Solution for Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 13
The optical fibre works on the principle of total internal reflection.
Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 14

Read the following text and answer the following questions on the basis of the same:

Optical Fibre:

Optical fibre works on the principle of total internal reflection. Light rays can be used to transmit a huge amount of data, but there is a problem here – the light rays travel in straight lines. So unless we have a long straight wire without any bends at all, harnessing this advantage will be very tedious. Instead, the optical cables are designed such that they bend all the light rays’ inwards (using TIR). Light rays travel continuously, bouncing off the optical fibre walls and transmitting end to end data. It is usually made of plastic or glass.

Modes of transmission: Single-mode fibre is used for long-distance transmission, while multi- mode fiber is used for shorter distances. The outer cladding of these fibres needs better protection than metal wires. Although light signals do degrade over progressing distances due to absorption and scattering. Then, optical Regenerator system is necessary to boost the signal.

Types of Optical Fibres: The types of optical fibers depend on the refractive index, materials used, and mode of propagation of light. The classification based on the refractive index is as follows:

  • Step Index Fibres: It consists of a core surrounded by the cladding, which has a single uniform index of refraction.

  • Graded Index Fibres: The refractive index of the optical fibre decreases as the radial distance from the fibre axis increases.

Q. Optical fibre is made of:

Detailed Solution for Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 14
Optical fibre is usually made of plastic or glass, so that light rays can travel continuously, bouncing off the optical fibre walls and can be transmitting end to end data.
Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 15

Read the following text and answer the following questions on the basis of the same:

Optical Fibre:

Optical fibre works on the principle of total internal reflection. Light rays can be used to transmit a huge amount of data, but there is a problem here – the light rays travel in straight lines. So unless we have a long straight wire without any bends at all, harnessing this advantage will be very tedious. Instead, the optical cables are designed such that they bend all the light rays’ inwards (using TIR). Light rays travel continuously, bouncing off the optical fibre walls and transmitting end to end data. It is usually made of plastic or glass.

Modes of transmission: Single-mode fibre is used for long-distance transmission, while multi- mode fiber is used for shorter distances. The outer cladding of these fibres needs better protection than metal wires. Although light signals do degrade over progressing distances due to absorption and scattering. Then, optical Regenerator system is necessary to boost the signal.

Types of Optical Fibres: The types of optical fibers depend on the refractive index, materials used, and mode of propagation of light. The classification based on the refractive index is as follows:

  • Step Index Fibres: It consists of a core surrounded by the cladding, which has a single uniform index of refraction.

  • Graded Index Fibres: The refractive index of the optical fibre decreases as the radial distance from the fibre axis increases.

Q. Light signal through optical fibre may degrade due to:

Detailed Solution for Case Based Questions Test: Ray Optics & Optical Instruments - 1 - Question 15
Light signals do degrade over progressing distances due to absorption and scattering.
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