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Geometrical Optics question

2021 · Q147
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Geometrical Optics question

2021 · Q147

NEETPhysicsGeometrical OpticsMCQ+4 / −1
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 :
  1. A
    30
  2. B
    25
  3. C
    15
  4. D
    50
View written solutionFree

Correct answer: C

NEET 2021 Physics - Geometrical Optics Question 19 English Explanation


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 cm
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