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Diameter of plano-convex lens is 6 \mathrm{cm}6cm and thickness at the cent

Diameter of plano-convex lens is 6 \mathrm{cm}6cm and thickness at the centre is 3 \mathrm{mm}3mm. If speed of light in material of lens is 2 \times 10^{8} \mathrm{m} / \mathrm{s}2×10 8 m/s, the focal length of the lens is:

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