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Q.

At what distance from a convex mirror of focal length 2.5 m should a boy stand so that his image has a height equal to half the original height ?

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a

2.5 m from the mirror

b

5 m from the mirror

c

7.5 m from the mirror

d

10 m from the mirror

answer is A.

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Detailed Solution

m=12, IO=vu=12 ; v=u/2 1f=1v+1u 12.5=2u+1-u=u=2.5 cm From mirror.
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