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The thickness at the centre of a plano-convex lens is 3 mm and the diameter is 6cm. If the speed of light in the material of the lens is 2×108 ms-1. The focal length of the lens is

Option 1 -

15 cm

Option 2 -

0.30 cm

Option 3 -

30 cm

Option 4 -

1.5 cm

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