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  • A parallel beam of light is made to fall on a concave mirror .an image is formed at a dis. of 7.5 cm from the mirror.what are the focal length and the radius of curvature of the mirror.

A parallel beam of light is made to fall on a concave mirror .an image is formed at a dis. of 7.5 cm from the mirror.what are the focal length and the radius of curvature of the mirror.

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best_answer

Using

\frac{1}{v}-\frac{1}{u}=\frac{1}{f}

and 

v = distance of object form mirror =  \infty
   u = distance of image from mirror = 7.5
 f = focal length of mirror = f

So we get f = 7.5 cm and R=15 cm

Posted by

avinash.dongre

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