Question

A concave mirror is a part of a sphere of radius 40cm. What is the focal length of the mirror.

Answer 1

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R = 2 × F

F = R / 2

F = 40 / 2

F = 20

Hence ,

Focal length = 20 cm

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Answer 2

R = 40 R = Radius

D = R / 2

40 / 2

20

F = 1 / P P= power F = focal
length .

1 / 20

= 20

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