Question

Focal length of convex lens is 2cm of refractive index 1.5 .focal length when it immersed in liquid of refractive index 1.25 will be​

Answer 1

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Thus, the focal length of the lens will increase. When any lens or glass slab is immersed in a liquid whose refractive index is equal to that of lens, refractive index of lens will be equal to 1 relative to that liquid. The focal length of the lens in this case, will tend to infinity.

Answer 2

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