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If lower half of the body of a lens is covered with black paper, the image produced by the lens will

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Important Questions on Geometrical Optics

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Two diverging lenses are kept as shown in the figure. The final image formed will be:

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In the figure shown an object O is placed in front of a thin lens of small aperture. The dotted curves represent the extensions of the respective curves in the figure. How many images will be formed finally.

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In the figure (i) a thin lens of focal length 10 cm is shown. The lens is cut into two equal parts, and the parts are arranged as shown in the figure (ii). An object AB of height 1 cm is placed at distance of 7.5 cm from the arrangement. The height of the final image will be:

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In the figure a the light is incident at an angle θ (slightly greater than the critical angle). Now keeping the incident ray fixed a parallel slab of refractive index n3 is placed on surface AB (figure b).

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                          Fig:(a)                                                                   Fig:(b)

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An equilateral prism deviates a ray through 40° for two angles of incidence differing by 20°. The possible angles of incidence is
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A man is sitting in a room at 2 m from a wall W1 wants to see the full height of the wall W2 behind him 4 m high and 6 m away from the facing wall W1. What is the minimum vertical length of the mirror on the facing wall required for the purpose?
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A flint glass prism and a crown glass prism are to be combined in such a way that the deviation of the mean ray is zero. The refractive index of flint and crown glasses for the mean ray are 1.6 and 1.9 respectively. If the refracting angle of the flint prism is 6°, what would be the refracting angle of the crown prism?
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A plane mirror is moving with velocity 4i^+5j^+8k^. A point object in front of the mirror moves with a velocity 3i^+4j^+5k^. Here k^ is along the normal to the plane mirror and facing towards the object. The velocity of the image is: