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Question

If AB = 10 cm & DB = 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



Since the diameter is equal to 40 cm then the radius of curvature is equal to half of it. Centre of curvature = radius of curvature = 20 cm. The focus is point A since parallel rays pass through point A. So, AB = focal length = 10 cm.


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