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A convex lens A of focal length 20cm and...

A convex lens A of focal length 20cm and a concave lens B of focal length 5cm are kept along the same axis with a distance d between them. I a parallel lbeam of leight falling on A leaved B as a parallel beam, then d is equal to `"____________"`cm.

A

25

B

15

C

20

D

40

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The correct Answer is:
B
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AAKASH INSTITUTE ENGLISH-RAY OPTICS AND OPTICAL INSTRUMENTS-Assignment (Section - B) Objective Type Questions (One option is correct)
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  8. Two prisms of same glass (mu = sqrt(2)) are stuck together without gap...

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  9. A short linear object of length b lies along the axis of a concave mir...

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  10. An object is placed 1m in front of the curved surface of a plano-conve...

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  11. Figure shows a torch sending a parallel beam of light fixed on a wall ...

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