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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

10 m from the mirror

c

7.5 m from the mirror

d

5 m from the mirror

answer is A.

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Detailed Solution

detailed_solution_thumbnail

m=ff−u

12=+2.52.5−u⇒u=−2.5

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