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Diameter of a plano-convex lens is 6cm a...

Diameter of a plano-convex lens is 6cm and thickness at the centre is 3mm. If speed of light in material of lens is `2xx10^(8)(m)/(s)`, The focal length of the lens is

A

15 cm

B

20 cm

C

30 cm

D

10 cm

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The correct Answer is:
C
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