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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NEET 2023 - Target Batch - Aryan Raj Singh

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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A thin lens whose power is +2D is cut into two pieces perpendicular to the principal axis. The focal length of each part will be

(1) 1 m

(2) 0.1 m

(3) 75 cm

(4) 0.05 m

Subtopic:  Lenses |
 75%
From NCERT
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A light ray is incident at an angle of 60° on one face of a  prism of a refractive angle 90°. If light ray grazes the second face, then the refractive index of the material of prism is-

1. 32

2. 2

3. 52

4. 72

Subtopic:  Prisms |
From NCERT
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