Question

a concave mirror produces three times enlarged image of an object placed at 10cm in front of it calculate the radius of curvature of mirror

Answer 1

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(a) ${\orange{\bold{The image formed in front of the concave mirror is real, so m is negative,}}}$

$<b>m = -3, u = -10 cm As m = -v/u or -3 = -v/-10 v = -30 cm By mirror formula, 1/f = 1/v + 1/u = 1/-30 + 1/-10 = -4/30 or f = -30/4 = -7.5 cm  Radius of curvature, R = 2f = 2 x (-7.5) = 15cm$

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