Question

When an object is kept at 6 cm in front of a concave mirror , its image is obtained at 24 cm behind the mirror . Find its focal length
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Answer 1

$\frac{1}{f} = \frac{1}{u} + \frac{1}{v} \\ \frac{1}{f} = \frac{1}{ - 6} + \frac{1}{24} \\ \frac{1}{f} = - \frac{1}{6} + \frac{1}{24} \\ \frac{1}{f} = \frac{ - 24 + 6}{144} \\ \therefore \: f= \frac{144}{ - 18} \\ f=(-8)cm \\ radius = 2×(-8)=-16cm$

Answer 2

Answer:

Answer is -16 cm.

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