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A boy is 1.8 m tall and can see his image in a plane mirror fixed on a wall. His eyes are 1.6 m from the floor level. The minimum length of the mirror to see his full image is:-
(a)0.9 m
(b)0.85 m
(c)0.8 m
(d)can't be determined

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Important Questions on Ray Optics
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An object as 'L' is placed between two parallel plane mirrors as shown. In the first seven closest images, how many laterally inverted images are formed?

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The correct mirror-image of the figure given is:-

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HARD
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There is a small air bubble inside a glass sphere ( = 1.5) of radius 10 cm. The bubble is 4 cm below the surface and is viewed normally from the outside as shown in figure. Find the apparent depth of the bubble.

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