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The diameter of a plano convex lens is 6...

The diameter of a plano convex lens is `6 cm` and thickness at the centre is `3 mm`. If the speed of light in the material of the lens is `2 xx 10^8 m//s`, what is the focal length of the lens ?

A

30 cm

B

10 cm

C

15 cm

D

20 cm

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The correct Answer is:
A
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