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CBSE Class 10 Answered

(a) A concave mirror produces three times enlarged image of an object placed at 10 cm in front of it. Calculate the radius of curvature of the mirror. (b) What is a lens?
Asked by Topperlearning User | 08 Dec, 2013, 08:40: AM
answered-by-expert Expert Answer

(a) The image formed in front of the concave mirror is real, so m is negative,

m = -3, u = -10 cm

As m = -v/u or -3 = -v/-10

v = -30 cm

By mirror formula,

1/f = 1/v + 1/u = 1/-30 + 1/-10 = -4/30

or f = -30/4 = -7.5 cm

 Radius of curvature, R = 2f = 2 x (-7.5) = 15cm

(b) A lens is a piece of transparent glass bound by two spherical surfaces.

Answered by | 08 Dec, 2013, 10:40: AM

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