Question

when an object is kept 60cm from the pole of a concave mirror having 20 cm focal length find the image distance

Answer 1

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Answer 2

The mirror formula is as follows :

1/u + 1/v = 1/f

u = image distance

v = object distance

f = focal length

Doing the substitution we have :

1/u + 1/60 = 1/20

1/u = 1/20 - 1/60

1/u = 1/30

u = 30 cm

Image distance = 30cm