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Q.

Parallel beam of light is incident on the system of two convex lenses of focal lengths f₁ = 20 cm and f₂ = 10 cm. What should be the distance between the two lenses so that rays after refraction from both the lenses pass undeviated?

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a

40 cm

b

60 cm

c

30 cm

d

90 cm

answer is B.

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Detailed Solution

$\frac{1}{f} = \frac{1}{f_{1}} + \frac{1}{f_{2}} - \frac{d}{f_{1} f_{2}}$

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