1.

An object of height 5 cm is placed 20 cm away from a convex mirror. Its image is formed at a distance of 12 cm behind the mirror. Calculate the focal length of the mirror using mirror formula. Also draw a scale diagram to locate the image. From the diagram, find out the length of the image formed.

Answer»

SOLUTION :`h_(0) = 5 cm,u = -20 cm,v = + 12 cm`
As we know, `1/f = 1/v + 1/u rArr 1/f = 1/12 - 1/20 = 30 cm, h_(1) = 3 cm` (on measurement)


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