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MHT CET Physics question

PhysicsRay Optics and Optical InstrumentsMHT CET

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 the distance 'd' between them. If a parallel beam of light falling on A leaves B as a parallel beam, then the magnitude of distance d (in cm) is [MHT-CET 2019]

Answer: (A)

Solution

For an afocal pair the image of A (at 20 cm) must be the focus of B:

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Question ID VK-069528