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Q.

A parallel beam of light is incident on a system of two convex lenses of focal length f1 = 20 cm and f2 = 10 cm

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What should be the distance between the two lenses so that the rays after refraction from both the lenses pass undeviated?

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a

60 cm

b

90 cm

c

40 cm

d

30 cm

answer is B.

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Detailed Solution

detailed_solution_thumbnail

1feff=1f1+1f2-df1f2

when feff = ∞ the rays will travel with out deviation as a parallel beam.

1∝=0 1f1+1f2=df1f2 d=f1+f2

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