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Q.

A boy stands straight infront of a mirror at a distance of 30cm away from it. He sees his erect image whose height is 15th of his real height. The mirror he is using is

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a

Plane mirror

b

Convex mirror

c

Concave mirror

d

Plano-convex mirror

answer is B.

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Detailed Solution

Size is 15. It can’t be plane and concave mirror, because both conditions are not satisfied in plane or concave mirror. Convex mirror can meet all the requirements
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A boy stands straight infront of a mirror at a distance of 30cm away from it. He sees his erect image whose height is 15th of his real height. The mirror he is using is