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A convex lens of focal length  and a concave lens of  focal length are placed so as to have the same axis. If a parallel beam of light falling on convex lens leaves concave lens as a parallel beam, then the distance between two lenses will be

a)

40

b)

30

c)

20

d)

10


Question ID - 153026 | Toppr Answer

A convex lens of focal length  and a concave lens of  focal length are placed so as to have the same axis. If a parallel beam of light falling on convex lens leaves concave lens as a parallel beam, then the distance between two lenses will be

a)

40

b)

30

c)

20

d)

10

1 Answer - 5876 Votes

3537

Answer Key : (c) -

(c)

Let distance between lenses be . As per the given condition, combination behaves as a plane glass plate, having focal length

So by using



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