Question

A concave mirror has focal length 12cm. An object is placed a) 20 cm (b) 30 cm from
the pole of mirror. List four characteristics of the image formed?
​

Answer 1

Answer:

Answer

Correct option is

C

60 cm

Given that,

Focal length of a concave mirror f=12cm

Object length h=4

Real image length h

′

=1cm

We know that,

m=−

u

v

=

−f−(u)

−f

−

u

1

=

−12−u

−12

12+u=−48

u=−48−12

u=−60cm

Hence, the object distance is 60 cm