First slide

Ray optics

Question

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

Moderate

A

20 cm
B

10 cm
C

40 cm
D

30 cm

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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