Question

A convex mirror of focal length of produces an image 1/nth of the size of the object .The distance of the object from

the mirror is

a. (n+1) f/n b. (n+1) f c. (n – 1) f d.(n – 1)f
/n​

Answer 1

Answer: (c) (n - 1) f.

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Answer 2

Answer:

c) (n-1) f

Explanation:

here focal length is f

magnification = v/u = 1/n

v=u/n

using mirror formula: 1/v+1/u=1/f

1/u/n + 1/-u = 1/f ( since object is on the left side)

n/u -1/u = 1/ f

(n - 1)/ u = 1/ f

u = (n-1)f