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MHT CET Physics question

PhysicsRay Optics and Optical InstrumentsMHT CET

An object is located on a wall, its image of equal size is to be obtained on a parallel wall with the help of a convex lens. The lens is placed at a distance 'd' in front of the second wall. The required focal length of the lens is [MHT-CET 2021]

Answer: (D)

Solution

An equal-sized real image needs ; since the image distance equals the lens-to-second-wall distance, , so

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Question ID VK-069489