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Ray Optics and Optical Instruments Part 3

Section: Physics

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Question : 4

Total: 56

A convex lens of refractive index 1.5 and focal length f=18cm is immersed in water. The difference in focal lengths of the given lens when it is in water and in air is α×f. The value of α is ____ .
(refractive index of water =4∕3 )

[28 Jan 2026 Shift 1]

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