Question

A 2cm height object is placed at a distance of 32 cm from a concave mirror the image real and virtual and 3 centimetre in size find the focal length of the mirror and position of the mirror where is image is formed ​

Answer 1

Answer:

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