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JEE Main 2022 Physics question

PhysicsRay Optics and Optical InstrumentsJEE Main 2022

Two identical thin biconvex lenses of focal length 15 cm and refractive index 1.5 are in contact with each other. The space between the lenses is filled with a liquid of refractive index 1.25. The focal length of the combination is cm.

Answer: 10

Solution

For each glass lens, 1/f = (1.5 − 1)(2/R) = 1/15, so R = 15 cm. The liquid forms a concave (diverging) lens between

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Question ID VK-024091