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NEET PHYSICSMedium

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

A

25

B

15

C

50

D

30

Step-by-Step Solution

Parallel beam of light after refraction from convex lens converge at the focus of convex lens. In question it is given light after refraction pass through concave lens becomes parallel. Therefore light refracted from convex lens virtually meet at focus of concave lens. According to above ray diagram d=fA−fB=20−5=15 cmd = f_A - f_B = 20 - 5 = 15 \text{ cm}

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Solved: PHYSICS Question for NEET | Sushrut