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A double convex lens of refractive index 1.5 has radii of 20 cm. Incident rays of light parallel to the axis will come to converge at a distance from the lens is

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20 cm

40 cm

30 cm

10 cm

answer is A.

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Detailed Solution

$μ = 1.5, R = 20 cm; f = \frac{R}{2 (μ - 1)} = 20 cm$

$\frac{1}{f} = \frac{1}{u} + \frac{1}{v}; f = 20 cm$

$Here u = \infty ∴ \frac{1}{f} = \frac{1}{v}; v = 20 cm$

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