Question

a converging mirror forms a real image of height 4cm of an object of height 1cm placed 20 cm away from the mirror: calculate the image distance and the focal length​

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A converging mirror forms a real image of height 4cm of an object of height 1cm placed 20cm away from the mirror. Calculate focal length of the mirror.

December 27, 2019

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Shlok Kedia

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ANSWER

Magnification m=

u

−v

−4=

−20

−v

v=−80cm

From mirror formula

v

1

+

u

1

=

f

1

−80

1

+

−20

1

=

f

1

f

1

=

−80

1+4

f=−16cm

Thus focal length of converging mirror is 16 cm.