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Question

# If AB = 10 cm & DB = 40 cm (diameter). What is the radius of curvature & focal length of the spherical glass?

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 Given: Diameter of the sphere = DB = 40 cm. Radius of curvature (DO or OB) is half of diameter of curvature (DB) = 20 cm. Focus is at point A since parallel rays after reflection pass through point A. Focal length (f) is half of the radius of curvature (R) ∴ f=R2 =202=10 cm

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