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JEE Main 2026 Physics question

PhysicsRay Optics and Optical InstrumentsJEE Main 2026

A convex lens of refractive index 1.5 and focal length is immersed in water. The difference in focal lengths of the given lens when it is in water and in air is . The value of is . (refractive index of water = 4/3)

Answer: 3

Solution

Using lensmaker's formula in air and water, $

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Question ID VK-001566