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31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1


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30 Questions MCQ Test Physics Class 12 | 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 for NEET 2023 is part of Physics Class 12 preparation. The 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 MCQs are made for NEET 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 below.
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31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 1

A light ray falls on a rectangular glass slab as shown. The index of refraction of the glass, if total internal reflection is to occur at the vertical face, is [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 1

For point B, sin (90° – r) = gμa where,
(90° – r) is critical angle.

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 2

A body is located on a wall. Its image of equal size is to be obtained on a parallel wall with the help of a convex lens. The lens is placed at a distance 'd' ahead of second wall, then the required focal length will be [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 2

Using the lens formula 

Given v = d, for equal size image |v | =|u|  d
By sign convention u = –d

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 3

An equiconvex lens is cut into two halves along (i) XOX' and (ii) YOY' as shown in the figure. Let f, f ', f '' be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively. [2003]

Choose the correct statement from the following

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 3

In this case, R1 and R2 are unchanged
So, f will remain unchanged for both pieces
of the lens
∴ f = f '

This is combination of two lenses of equal
focal lengths

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 4

A convex lens is dipped in a liquid whoserefractive index is equal to the refractive index ofthe lens. Then its focal length will [2003]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 4

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 5

The refractive index of the material of a prism is√2 and its refracting angle is 30º. One of therefracting surfaces of the prism is made a mirrorinwards. A beam of monochromatic light entersthe prism from the mirrored surface, then its angleof incidence of the prism is [2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 5

∠r = 30° (using law of triangle)

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 6

A beam of light composed of red and green raysis incident obliquely at a point on the face ofrectangular glass slab. When coming out onthe opposite parallel face, the red and green raysemerge from         [2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 6

Since refractive index for both the light are
different, so they emerge out moving in two
different parallel directions.

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 7

A telescope has an objective lens of 10 cmdiameter and is situated at a distance of onekilometer from two objects. The minimumdistance between these two objects, which canbe resolved by the telescope, when the meanwavelength of light is 5000 Å, is of the order of             [2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 7

or, x = 1.22 × 5 × 10–3 m = 6.1 mm
∴ x is of the order of 5 mm.

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 8

The angular resolution of a 10 cm diametertelescope at a wavelength of 5000 Å is of theorder of     [2005]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 8

Two-point sources are regarded as just resolved when the principal diffraction maximum of one image coincides with the first minimum of the other.
If one considers diffraction through a circular aperture, this translates into the expression
θ=1.22 λ/d​=1.22×(5000×10−8/10​)=1.22×5×10−6=6×10−6rad
Hence, the closest option is 10−6rad

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 9

A convex lens and a concave lens, each havingsame focal length of 25 cm, are put in contact toform a combination of lenses. The power indiopters of the combination is  [2006]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 9

From the formula,

Power of combination 

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 10

A microscope is focussed on a mark on a pieceof paper and then a slab of glass of thickness 3cm and refractive index 1.5 is placed over themark. How should the microscope be moved toget the mark in focus again ? [2006]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 10

In the later case microscope will be focussed for O'. So, it is required to be lifted by distance OO'.

OO' = real depth of O – apparent depth of O.

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 11

The frequency of a light wave in a material is2 × 1014 Hz and wavelength is 5000 Å. Therefractive index of material will be [2007]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 11

By using v = nλ
Here, n = 2 x1014Hz

Refractive index of the material,

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 12

A small coin is resting on the bottom of a beaker filled with liquid. A ray of light from the coin travels upto the surface of the liquid and moves along its surface. How fast is the light travelling in the liquid? [2007]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 12

Hypotenuse comes out to be 5 cm.

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 13

Two thin lenses of focal lengths f1 and f2 are in contact and coaxial. The power of the combination is: [2008]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 13

The focal length of the combination

∴ Power of the combinations

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 14

A boy is trying to start a fire by focusing sunlighton a piece of paper using an equiconvex lens offocal length 10 cm. The diameter of the Sun is 1.39 ×109 m and its mean distance from the earthis 1.5 × 1011 m. What is the diameter of the Sun’simage on the paper? [2008]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 14

We have,  

or, Size of image = 

∴ Diameter of the sun’s image = 9.2 × 10–4 m.

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 15

A ray of light travelling in a transparent mediumof refractive index μ , falls on a surface separatingthe medium from air at an angle of incidence of450 . For which of the following value of μ theray can undergo total internal reflection? [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 15

For total internal reflection,

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 16

Which of the following is not due to total internalreflection?    [2011]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 16

Difference between apparent and real depth
of a pond is due to the refraction of light,
not due to the total internal reflection. Other
three phenomena are due to the total
internal reflection.

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 17

A biconvex lens has a radius of curvature ofmagnitude 20 cm. Which one of the followingoptions best describe the image formed of anobject of height 2 cm placed 30 cm from the lens?   [2011]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 17

R = 20 cm
h0 = 2
u = –30 cm

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 18

A thin prism of angle 15º made of glass ofrefractive index μ1 = 1.5 is combined with anotherprism of glass of refractive index μ2 = 1.75. Thecombination of the prism produces dispersionwithout deviation. The angle of the second prismshould be [2011M]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 18

Deviation = zero

or A2 = – 10°.
Negative sign shows that the second prism
is inverted with respect to the first.

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 19

A converging beam of rays is incident on adiverging lens. Having passed through the lensthe rays intersect at a point 15 cm from the lenson the opposite side. If the lens is removedthe point where the rays meet will move 5 cmcloser to the lens. The focal length of the lensis [2011M]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 19

 

By lens formula

Putting the values, we get

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 20

When a biconvex lens of glass having refractiveindex 1.47 is dipped in a liquid, it acts as a planesheet of glass. This implies that the liquid musthave refractive index. [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 20

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 21

A ray of light is incident at an angle of incidence, i, on one face of prism of angle A (assumed to be small) and emerges normally from the opposite face. If the refractive index of the prism is μ, the angle of incidence i, is nearly equal to: [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 21

For normally emerge e = 0
Therefore r2 = 0 and r1 = A
Snell’s Law for Incident ray’s
1 sin i = μ sin r1 = μsin A
For small angle
i = μA

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 22

f1’ is placed ata distance of 'd’ from a convex lens of focal length ‘f2’. A beam of light coming from infinity andfalling on this convex lens-concave mirrorcombination returns to infinity. The distance ‘d’ must equal :    [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 22

d= f1 + 2f2

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 23

The magnifying power of a telescope is 9. Whenit is adjusted for parallel rays the distancebetween the objective and eyepiece is 20 cm.The focal length of lenses are :    [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 23

f0 = 18 cm = focal length of the objective
fe = 2 cm = focal length of the eyepiece

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 24

For the angle of minimum deviation of a prism tobe equal to its refracting angle, the prism mustbe made of a material whose refractive index :            [2012M]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 24

The angle of minimum deviation is given as
δmin = i + e–A
for minimum deviation
δmin = A then
2A = i + e
in case of δmin i = e

from smell’s law

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 25

A rod of length 10 cm lies along the principalaxis of a concave mirror of focal length 10 cm insuch a way that its end closer to the pole is20 cm away from the mirror. The length of theimage is : [2012M]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 25

The focal length of the mirror

For A end of the rod the image distance
When u1 = – 20 cm

For when u2 = – 30 cm

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 26

The condition under which a microwave ovenheats up a food item containing water moleculesmost efficiently is [NEET 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 26

Required condition : Frequency of
microwaves = Resonant frequency of
water molecules.

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 27

A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices μ1 and μ2 and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is [NEET 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 27

Hence, focal length of the combination is

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 28

For a normal eye, the cornea of eye provides aconverging power of 40D and the leastconverging power of the eye lens behind thecornea is 20D. Using this information, thedistance between the retina and the eye lens ofthe eye can be estimated to be [NEET 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 28

Power of Cornea, P1​=40D
and power of the eye lens, P2​=20D
Peff​=P1​+P2
⇒Peff​=40D+20D=60D
So, f= ​100/ Peff ​=100​/60=1.67cm
 

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 29

Two plane mirrors are inclined at 70°. A rayincident on one mirror at angle θ after reflectionfalls on second mirror and is reflected from thereparallel to first mirror. The value of θ is[NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 29

From fig. 40° + θ = 90° ∴ θ = 90° – 40° = 50°

31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 30

The reddish appearance of the sun at sunriseand sunset is due to [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Ray Optics & Optical Instruments - 1 - Question 30

It is due to scattering of light. Scattering  Hence the light reaches us is rich in
red

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