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Test: Refraction through Glass - UPSC MCQ


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10 Questions MCQ Test Science & Technology for UPSC CSE - Test: Refraction through Glass

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Test: Refraction through Glass - Question 1

Speed of light in vacuum is:​

Detailed Solution for Test: Refraction through Glass - Question 1

The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. It's exact value is defined as 299 792 458 metres per second ( or approximately, 3*108 m/s)

Test: Refraction through Glass - Question 2

What will happen when a ray enters from glass to air medium ?

Detailed Solution for Test: Refraction through Glass - Question 2

When a ray enters from glass to air medium, it bends away from the normal. This phenomenon is known as refraction. Here's a detailed explanation:

- Light rays change speed and direction when they pass from one medium to another with a different optical density.
- As light travels from glass (higher optical density) to air (lower optical density), it bends away from the normal (an imaginary line perpendicular to the surface).
- This bending of light is due to the change in speed of light in different mediums, causing the ray to deviate from its original path.

Therefore, the correct answer is B: It bends away from normal.

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Test: Refraction through Glass - Question 3

The speed of light in glass is 1.5 x 108m/s. Then refractive index of glass is

Detailed Solution for Test: Refraction through Glass - Question 3

Test: Refraction through Glass - Question 4

Light travels faster in substance X as compared to substance Y, then refractive index is greater for

Detailed Solution for Test: Refraction through Glass - Question 4

Light travels faster in substance X compared to substance Y, indicating the refractive index is greater for:
The refractive index (n) is inversely proportional to the speed of light in a substance.
If light travels faster in substance X, it means X has a lower refractive index than Y.
Therefore, the refractive index is greater for substance Y.
The correct answer is B: Substance-Y.

Test: Refraction through Glass - Question 5

During refraction through a rectangular glass slab, what can be said about the angle of incidence and the angle of refraction at the refracting surfaces?

Detailed Solution for Test: Refraction through Glass - Question 5

During refraction through a rectangular glass slab, the following points apply:

  1. Angle of Incidence and Angle of Refraction at the First Surface:

    • When light enters the rectangular glass slab from air (or another medium), it bends towards the normal due to the higher refractive index of glass compared to air.
    • The angle of incidence (i1​) at the first surface is always greater than the angle of refraction (r1​).
  2. Angle of Incidence and Angle of Refraction at the Second Surface:

    • As light exits the glass slab and enters back into air, it bends away from the normal because the refractive index of air is less than that of glass.
    • The angle of incidence (i2​) at the second surface is equal to the angle of refraction (r2​).

Summary:

  • The angle of incidence is always greater than the angle of refraction at the first surface of the slab.
  • The angle of incidence is equal to the angle of refraction at the second surface of the slab.

So, the correct option is: Option D

Test: Refraction through Glass - Question 6

Light enters from air to glass having a refractive index of 1.50. What is the speed of light in the glass? The speed of light in a vacuum is 3×108 m/s.

Detailed Solution for Test: Refraction through Glass - Question 6

The speed of light in a medium can be calculated using the refractive index formula:

Refractive Index (n) = Speed of Light in Vacuum (c) / Speed of Light in Medium (v)
Given:
Refractive Index of Glass (n) = 1.50
Speed of Light in Vacuum (c) = 3 × 108 m/s
Rearranging the formula to find v:
v = c / n
Substitute the values:
v = (3 × 108 m/s) / 1.50
Calculating:
v = 2 × 108 m/s
So, the correct answer is:
A: 2 × 108 m/s

Test: Refraction through Glass - Question 7

A light ray is incident at an angle of 30 degrees on a medium with a refractive index of 1.5. What is the angle of refraction if the light is moving from air to the medium?

Detailed Solution for Test: Refraction through Glass - Question 7

Test: Refraction through Glass - Question 8

What does Snell's law of refraction state?

Detailed Solution for Test: Refraction through Glass - Question 8
  • Snell's law of refraction states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant.
  • This law, also known as Snell's Law, describes how light behaves when it passes through different mediums.
  • It helps us understand how light bends when it moves from one medium to another, based on their refractive indices.
Test: Refraction through Glass - Question 9
The refractive index of diamond is 2.42. What is the meaning of this statement?
Detailed Solution for Test: Refraction through Glass - Question 9
A refractive index of 2.42 for diamond means that light travels slower in diamond than in air. The refractive index is the ratio of the speed of light in a vacuum to the speed of light in the medium. A higher refractive index indicates a greater reduction in the speed of light within the medium.
Test: Refraction through Glass - Question 10
Which of the following statements about the refractive index of water is true?
Detailed Solution for Test: Refraction through Glass - Question 10
The refractive index of water is typically around 1.33, which is greater than 1 but less than 2. This value indicates that light travels slower in water compared to air but not as slowly as in more optically dense materials like glass
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