The size of the image of an object, which is at infinity, as formed by a convex lens of

focal length 30 cm is 2 cm. If a concave lens of focal length 20 cm is placed between the

convex lens and the image is at a distance of 26 cm from the convex lens, calculate the

new size of the image.

1. 1.25 cm                             

2. 2.5 cm

3. 1.05 cm                             

4. 2 cm

Subtopic:  Lenses |
 62%
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An achromatic prism is made by crown glass prism Ac=19° and flint glass prism

AF=6°. If μvC=1.5 and μvF=1.66, then resultant deviation for red coloured ray will

be

1. 1.04°                     

2. 5°

3. 0.96°                     

4. 13.5°

Subtopic:  Prisms |
 53%
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An isosceles prism of angle 120° has a refractive index of 1.44. Two parallel

monochromatic rays enter the prism parallel to each other in air as shown. The rays

emerging from the opposite faces :

                               

1. Are parallel to each other

2. Are diverging

3. Make an angle 2sin-10.72 with each other

4. Make an angle 2sin-10.72-30° with each other

Subtopic:  Prisms |
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A ray of light is incident on the hypotenuse of a right-angled prism after travelling parallel

to the base inside the prism. If μ is the refractive index of the material of the prism, the

maximum value of the base angle for which light is totally reflected from the hypotenuse

is 

1. sin-11μ                            

2. tan-11μ

3. sin-1μ-1μ                        

4. cos-11μ

Subtopic:  Total Internal Reflection |
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A plano-convex lens when silvered in the plane side behaves like a concave mirror of

focal length 30 cm. However, when silvered on the convex side it behaves like a concave

mirror of focal length 10 cm. Then the refractive index of its material will be 

1. 3.0                               

2. 2.0

3. 2.5                               

4. 1.5

Subtopic:  Lenses |
 55%
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A ray of light travels from an optically denser to rarer medium. The critical angle for the

two media is C. The maximum possible deviation of the ray will be

1. π2-C                         

2. 2C

3. π-2C                             

4. π-C

Subtopic:  Total Internal Reflection |
 59%
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A point object is moving on the principal axis of a concave mirror of focal length \(24\) cm towards the mirror. When it is at a distance of \(60\) cm from the mirror, its velocity is \(9\) cm/secWhat is the velocity of the image at that instant?
1. \(5\) cm/sec towards the mirror
2. \(4\) cm/sec towards the mirror
3. \(4\) cm/sec away from the mirror
4. \(9\) cm/sec away from the mirror
Subtopic:  Reflection at Spherical Surface |
 53%
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A room (cubical) is made of mirrors. An insect is moving along the diagonal on the floor

such that the velocity of image of insect on two adjacent wall mirrors is 10 cms-1. The

velocity of image of insect in ceiling mirror is

1. 10 cms-1                           

2. 20 cms-1

3. 102cms-1                          

4. 102cms-1

Subtopic:  Reflection at Plane Surface |
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Figure shows a cubical room ABCD with the wall CD as a plane mirror. Each side of the

room is 3m. We place a camera at the midpoint of the wall AB. At what distance should

the camera be focussed to photograph an object placed at A

                    


1. 1.5 m                                     

2. 3 m

3. 6 m                                         

4. More than 6 m

Subtopic:  Reflection at Plane Surface |
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If an object moves towards a plane mirror with a speed v at an angle θ to the

perpendicular to the plane of the mirror, find the relative velocity between the object and

the image

                

1. v                                           

2. 2v

3. 2v cos θ                                    

4. 2v sin θ

Subtopic:  Reflection at Plane Surface |
 79%
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