If the wavelength of a ray of light from a source of lights is 3000 A0in air, then the wavelength of that ray of light in a liquid in which S is placed will be:

(1) 4000 A0

(2) 1500 A0

(3) 9000 A0

(4) 3500 A0

Subtopic:  Refraction at Plane Surface |
 85%
From NCERT
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A ray of light incident at an angle i is refracted at angle r into a glass slab of thickness t. The lateral displacement of the emergent ray is

1.  t sin icos r

2.  t sin i-rcos r

3.  t sin (i-r) cos r

4.  t sin i+rcos r

Subtopic:  Refraction at Plane Surface |
 87%
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Chromatic aberration is absent in

(1) Plano-convex lens

(2) Plano concave lens

(3) Concave mirror

(4) Bifocal lens

Subtopic:  Lenses |
 56%
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For a convex lens of focal length 15 cm the dispersive power of its material is 0.05. The longitudinal chromatic aberration of the lens is

(1) 3.6×10-4 m

(2) 700 cm

(3) 7.5 mm

(4) 1.34 μm

Subtopic:  Lenses |
 62%
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A convex mirror of a focal length f (in air) is immersed in water μ=43. Focal length of the mirror in water will be

1.  f

2.  43f

3.  34f

4.  4f

Subtopic:  Reflection at Spherical Surface |
 68%
From NCERT
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A plane mirror is placed on x-z plane and is free to rotate about z-axis. A fixed object in on x-y plane at a point O(5m, 5m). When mirror starts rotating anticlockwise with angular speed 5 rad/s about z-axis. The initial linear speed of image is

1. 25m/s

2. 252m/s

3. 50m/s

4. 502m/s

Subtopic:  Reflection at Plane Surface |
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An object is placed at infinite distance from a concave lens. If m is magnification obtained in the size of the image; then

(1) m=0

(2) m<<-1

(3) m>-1

(4) m<<+1

Subtopic:  Lenses |
 50%
From NCERT
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The diameter of a plano-convex lens is 5 cm and thickness at the centre is 5 mm. If the refractive index of the material of the lens is 1.5, the focal length of the lens is (approximately)

1.  13 cm

2.  15 cm

3.  20 cm

4.  6.35 cm

Subtopic:  Lenses |
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A point object O is placed at distance 20 cm from a biconvex lens of radius of curvature 20 cm and μ=1.5. The final image produced by lens and mirror combination will be at

(1) 10 cm from the mirror

(2) 20 cm from lens

(3) -20 cm from lens

(4) -15 cm from the mirror

Subtopic:  Refraction at Curved Surface |
 53%
From NCERT
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If the angle of a triangular prism is A and the refractive index of the material is μ, then under what condition will there be no emergent ray?

1.  A = 2 sin-11μ

2.  A < 2 sin-11μ

3.  sin-11μ < A < 2 sin-1μ

4.  A > 2 sin-11μ

Subtopic:  Prisms |
 55%
From NCERT
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