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The radius of curvature of a concave mir...

The radius of curvature of a concave mirror is 15 cm. Its focal length will be

A

`-15` cm

B

`-7.5` cm

C

`+30` cm

D

`+7.5` cm

Text Solution

Verified by Experts

The correct Answer is:
B
Focal length `= ("Radius of curvature")/(2) = (15)/(2)`
`therefore" "f = - 7.5` cm
The focal length of concave lens is -7.5 cm.
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