Question

2. Show that if an object be n times the focal length to the right of principal
focus of a concave mirror, the image will be 1/n times the focal length to the
right of the focus and the magnification will be 1/n.
Tha​

Answer 1

Explanation:

Since the image is real, it must be inverted and magnification ratio should be negative.

Mgnification =

u

−v

−n=

d

−v

, u=d is the distance of object and and image distance is v

v=nd

Now using mirror formula

f

1

=

v

1

+

u

1

f

1

=

nd

1

+

d

1

So d=

n

f(n+1)

hope it is helpful