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Question

If AO= 10 cm & BO = 40 cm (diameter). What is the radius of curvature & focal length?


A

40 cm, 10 cm

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B

20 cm, 20 cm

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C

40 cm, 5 cm

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D

20 cm, 10 cm

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Solution

The correct option is D

20 cm, 10 cm


Here C is the centre of sphere.
Radius of curvature R = 20 cm. Focus is point A since parallel rays pass through point A. So, AO = focal length = R2 = 10 cm


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