Question

What is the nature of a mirror whose focal length is 12 cm

Answer 1

Answer:

Images are always virtual.

Explanation:

Since focal length is 12 cm, i.e. +12 cm

So, it is a convex mirror.

The images will always be virtual and in reduced size.

Answer 2

Answer:

The focal length of a concave mirror is 12 cm.

Given that,

Focal length of a concave mirror f=12cm

Object length h=4

Real image length h = 1cm

We know that,

m=− uv = −f−(u) −f − u1 = −12−u−12

12+u=−48

u=−48−12

u=−60cm

Hence, the object distance is 60 cm.

Hope this answer helps you!!!