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  • A convex lens 'A' of focal length 20 cm and a concave lens 'B' of focal length 5 cm are kept along the same axis with a distance 'd' between them. if a parallel beam of ligh

A convex lens 'A' of focal length 20 cm and a concave lens 'B' of focal length 5 cm are kept along the same axis with a distance 'd' between them. if a parallel beam of light falling on 'A' leaves'B' as a parallel beam ,then the distance 'd' in cm will be:

Option: 1

25


Option: 2

15


Option: 3

50


Option: 4

30


Answers (1)

f_{A}=20 \mathrm{~cm} \quad f_{B}=5 \mathrm{~cm}

f_{A}-f_{B}=d

d=15 \mathrm{~cm}

Posted by

Sumit Saini

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