Question

a concave lens has focal length of 15 CM at what distance should the object from the lens be placed so that it form an image at 10 cm from the lens also find the magnification produced by the lens

Answer 1

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Answer 2

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GIVEN :

focal length =f=-15 cm after sign conventions

image distance=V=-10cm

object distance=?

by lens formula:

1/f=1/v-1/u

1/u=1/v-1/f

= -1/10+1/15

= -3+2/30

=-1/30

u=-30cm

Magnification=m=v/u

=-10/-30=1/3=0.33