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MHT CET Physics question

PhysicsRay Optics and Optical InstrumentsMHT CET

We combined a convex lens of focal length and a concave lens of focal length and their combined focal length was . The combination of these lenses will behave like a concave lens, if

Answer: (A)

Solution

(magnitudes); is negative (concave) when , i.e. ; for

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Question ID VK-069344