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QNEET-2021-Ph-635: NEET 2021 Physics - Class 12 NEET-2021-Ph-635 Solution: A convex lens 'A' of focal length 20 cm and a concave lens 'B'…
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: 30 25 15 50
Multiple Choice Options
- A 30
- B 25
- C 15
- D 50
Step-by-Step Verified 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 = f A _ f B
= 20 _ 5
= 15 cm