A plane mirror is placed at the bottom of a fish tank filled with water of refractive index 43. The fish is at a height 10 cm above the plane mirror. An observer O is vertically above the fish outside water. The apparent distance between the fish and its image is:
                         

1. 15 cm

2. 30 cm

3. 35 cm

4. 45 cm

Subtopic:  Refraction at Plane Surface |
 62%
From NCERT
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A liquid of refractive index 43 is placed between two identical planoconvex-lenses touching each other at their spherical surfaces of radius R. If the refractive index of the lens is 1.50, then the lens behaves as:

1. a convergent with power \(\mathrm{P}=\frac{1}{3 R}\)
2. a convergent with power \(\mathrm{P}=\frac{1}{6 R}\)
3. a divergent with power \(\mathrm{P}=\frac{1}{3 R}\)
4. a divergent with power \(\mathrm{P}=\frac{1}{6 R}\)

Subtopic:  Lenses |
 59%
From NCERT
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If there is no emergent light through a prism of refracting angle \(60^{\circ},\) whatever may be the angle of incidence, then the minimum value of the refractive index of the material of the prism is:

1.  2

2.  2

3.  1.5

4.  3

Subtopic:  Prisms |
 52%
From NCERT
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The Refractive index of material of an equilateral prism is 2. Angle of incidence for minimum deviation is:

1. \(60^{\circ}\)

2. \(45^{\circ}\)

3. \(30^{\circ}\)

4. \(15^{\circ}\)

Subtopic:  Prisms |
 72%
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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If \(C_1,~C_2 ~\mathrm{and}~C_3\) are the critical angle of glass-air interface for red, violet and yellow color, then:

1. \(C_3>C_2>C_1\) 2. \(C_1>C_2>C_3\)
3. \(C_1=C_2=C_3\) 4. \(C_1>C_3>C_2\)
Subtopic:  Total Internal Reflection |
 67%
From NCERT
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An astronomical telescope has angular magnification of 40 in its normal adjustment. If focal length of eyepiece is 5 cm, the length of the telescope is:
1. 190 cm
2. 200 cm
3. 205 cm
4. 210 cm

Subtopic:  Telescope |
 80%
From NCERT
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The focal length of a convex lens is 40 cm and the size of the inverted image formed is half of the object. The distance of the object is:

1. 60 cm 2. 120 cm
3. 30 cm 4. 180 cm
Subtopic:  Lenses |
 80%
From NCERT
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The condition of minimum deviation is achieved in an equilateral prism kept on the prism table of a spectrometer. If the angle of incidence is \(50^{\circ}\), the angle of deviation is:
1. \(25^{\circ}\)

2. \(40^{\circ}\)

3. \(50^{\circ}\)

4. \(60^{\circ}\)

Subtopic:  Prisms |
 82%
From NCERT
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