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MHT CET Physics question

PhysicsRay Optics and Optical InstrumentsMHT CET

A convex lens of focal length '' and concave lens of focal length '' are combined to have effective focal length 'F'. This combination of lenses will behave like a concave lens, if [MHT-CET 2015]

Answer: (A)

Solution

Taking magnitudes, is negative (concave) only if , i.e. ; gives

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Question ID VK-069542