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Combinations of Lenses & Mirrors

Parallel beam...

Question

Parallel beam of light is incident on the system of two convex lenses of focal length $f_{1} = 20$ cm and $f_{2} = 10$ cm. What should be the distance between the two lenses so that rays after refraction from both the lenses pass undeviated

A

60 cm

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B

30 cm

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C

90 cm

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D

40 cm

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Solution

The correct option is B 30 cm
As shown in figure the distance between the lenses should be 30 cm.

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