Question

A concave mirror off focal length 16 CM is 20 CM away from object.. what's the size of image and Where is the image formed?​

Answer 1

Answer:

Magnification m=

u

−v

−4=

−20

−v

v=−80cm

From mirror formula

v

1

+

u

1

=

f

1

−80

1

+

−20

1

=

f

1

f

1

=

−80

1+4

f=−16cm

Thus focal length of converging mirror is 16 cm.