Question

Answer the following questions:
An object is placed at a distance of 40 cm from a concave
mirror of focal length 15.cm. Find the image distance.​

Answer 1

Answer:

GIVEN:-

u=-40cm

f=-15cm

u'=-20cm

first 1/f=1/u+1/v

1/v=1/f-1/u

=-1/15+1/40

= -1/24

v=-24cm

Again

1/f'=1/u'+1/v'

1/v'=1/f'-1/u'

=-1/15+1/20

= -1/60

v' = -60 cm

the image is displaced is 20cm

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