Question

In a concave mirror a object is placed at distance d1 from focus an image if formed at distance d2 from focus the focal length of mirror is

Answer 1

Given,
Object distance, u=-(x1 +f)
Image distance, v= -(x2 +f)
Focal length,F=-f
Using mirror formula,
1/v + 1/u=1/F
-1/(x2 +f) - 1/ (x1 +f)=-1/f
On solving, we get
f=√x1x2

Answer 2

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