# The length of an astronomical telescope adjusted for parallel light is 90 cm. If the magnifying power of the telescope is 17, then the focal length of eyepiece and objective are respectively: 1. 10 cm and 80 cm 2. 85 cm and 5 cm 3. 70 cm and 20 cm 4. 5 cm and 85 cm

Subtopic:  Telescope |
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A ray of light falls on a transparent sphere as shown in the figure. If the final ray emerges from the sphere parallel to the horizontal diameter, then calculate the refractive index of the sphere. Consider that the sphere is kept in the air.

1.

2.

3.

4.  $\sqrt{4/3}$

Subtopic:  Refraction at Curved Surface |
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Two identical equiconvex thin lenses each of focal lengths 20 cm, made of material of refractive index 1.5 are placed coaxially in contact as shown. Now, the space between them is filled with a liquid with a refractive index of 1.5. The equivalent power of this arrangement will be:

1. +5 D

2. zero

3. +2.5 D

4. +0.5 D

Subtopic:  Lens Makers' Formula |
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Absolute refractive indices of glass and water are 3/2 and 4/3. The ratio of velocity of light in glass and water will be

1.  4:3

2.  8:7

3.  8:9

4.  3:4

Subtopic:  Refraction at Plane Surface |
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A ray of light incident on an equilateral prism at grazing incidence emerges from the prism at grazing emergence. The Refractive index of the prism is:

1. 1.5

2. 1.8

3. 1.33

4. 2

Subtopic:  Prisms |
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Which of the following is not due to the total internal reflection of light

1.  Brilliance of the diamond

2.  Mirage on hot summer days

3.  Working of optical fiber

4.  Difference between real and apparent depth of a pound

Subtopic:  Total Internal Reflection |
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A point source of light B is placed at a distance L in front of the centre of a mirror of width d hung vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance 2L from it as shown. The greatest distance over which he can see the image of the light source in the mirror is

(1) d/2

(2) d

(3) 2d

(4) 3d

Subtopic:  Reflection at Plane Surface |
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Two plane mirrors, A and B are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle of $30°$ at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (excluding the first one) before it emerges out is:

1.  28

2.  30

3.  32

4.  34

Subtopic:  Reflection at Plane Surface |
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A concave mirror of focal length $$100$$ cm is used to obtain the image of the sun which subtends an angle of $$30'.$$ The diameter of the image of the sun will be:
1. $$1.74$$ cm
2. $$0.87$$ cm
3. $$0.435$$ cm
4. $$100$$ cm

Subtopic:  Reflection at Spherical Surface |
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A square of side 3 cm  is placed at a distance of 25 cm from a concave mirror of focal length 10 cm. The centre of the square is at the axis of the mirror and the plane is normal to the axis. The area enclosed by the image of the square is:

1.

2.

3.

4.

Subtopic:  Reflection at Spherical Surface |
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