Answer:

HOPE IT HELPS YOU

Explanation:

Correct option is C)

Given,

The size of the image is n1 size of object, hence if object height is u then image height v is given as

v=nu                                …… (1)

For convex lens:

The object distance is −u

The image distance is v

The focal length is f

Now applying the mirror formula

f1=v1+−u1                      ……. (2)

Substituting the value of equation (1) in equation (2)

f1=un+−u1⇒f1=un−1

∴u=(n−1)f