Question

The focal length of a concave mirror is 12 cms. An object is placed at 24 cms , the image formed will be

Answer 1

Explanation:

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

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