Q.

A convex mirror of focal length f forms an image which is 1n times the object. The distance of the object from the mirror is

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a

(n−1)f

b

n−1nf

c

n+1nf

d

(n+1)f

answer is A.

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Detailed Solution

m=+1n=−vu⇒v=−un By using mirror formula  1f=1−un+1u ⇒u=−(n−1)f
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A convex mirror of focal length f forms an image which is 1n times the object. The distance of the object from the mirror is