MHT CET Physics question

PhysicsRay Optics and Optical InstrumentsMHT CET

A convex lens A of focal length cm and a concave lens B of focal length cm are kept along the same axis with the distance between them. If a parallel beam of light falling on A leaves B as a parallel beam, then distance (in cm), will be

Answer: (B)

Solution

For the emergent beam to be parallel the system must be afocal: ,

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Question ID VK-069390