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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

20 cm

B

30 cm

C

10 cm

D

15 cm

Text Solution

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The correct Answer is:
B
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