Question

a 2cm high object is placed at a distance of 32cm from a concave mirrror the image is real inverted and 3cm in size find the focal length and position of image

Answer 1

concave mirror:
u = -32 cm h = 2 cm h' = -3 cm image
m = h'/h = -3/2
m = -v/u = -3/2 => v = 3 u /2 = - 48 cm

1/f = 1/ u + 1/v
= -1/48 - 1/32 = - 5/96
f = - 19.2 cm


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