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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The near point of a hypermetropic eye is 1m. What is the power of the lens required to correct this defect?

(1) -3 D

(2) +3 D

(3) +1 D

(4) -1.75 D

Subtopic:  Human Eye |
 61%
From NCERT
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The minimum magnifying power of an astronomical telescope is 40. If the length of the telescope is 205 cm, then the focal length of its field lens is:

1. 5 cm

2. 200 cm

3. 40 cm

4. 140 cm

Subtopic:  Telescope |
 66%
From NCERT
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A boy with defective eye-sight cannot see things beyond 50 cm. The corrective lens required has the power:

1. +1 D

2. +2 D

3. -1 D

4. -2 D

Subtopic:  Human Eye |
 69%
From NCERT
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The focal lengths of the objective and eyepiece of a terrestrial telescope are 50 cm and 10 cm respectively. The magnifying power of the telescope when the final image is formed at infinity is

(1) 3.75

(2) -2.5

(3) -4.25

(4) +5

Subtopic:  Telescope |
 87%
From NCERT
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A convex mirror of focal length \(20\) cm forms an image that is quarter of the object's size. The distance of the object from the mirror is:
1. \(50\) cm
2. \(-60\) cm
3. \(-40\) cm
4. \(-70\) cm

Subtopic:  Reflection at Spherical Surface |
 84%
From NCERT
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The focal length of a thin convex lens for red and blue light is 0.5m and 0.484m.  The dispersive power of the lens is 

1. 0.984

2. 0.032

3. 0.484

4. 0.434

Subtopic:  Lenses |
 69%
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