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Question

- 20 cm
- 30 cm
- 25 cm
- 22 cm

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Solution

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1v−1(−12)=110

1v=1(10)−112=/2/12060

v=60cm[this is at the centre of curvature of the mirror]

Thus we get the radius of curvature as

v−d=R

60−10=R⇒R=50cm

thus we get the focal length as f=R2=25cm

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