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