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In an experiment to find the focal lengt...

In an experiment to find the focal length of a concave mirror, an object is placed at a distance of 40 cm from it and forms image at 24 cm from the mirror, then the focal length is

A

`-15` cm

B

`-16` cm

C

`-30` cm

D

`-32` cm

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The correct Answer is:
A
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