Question

Give the reason,any lens is dipped inside the liquid,then it's focal length increase.,why

Answer 1

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• A concave mirror and covex lens are held in water. Refractive index of glass with respect to water is greater than refractive index of glass with respect to air. Therefore, when a convex lens is dipped into water, its focal length increases.

Answer 2

Explanation:

• A concave mirror and covex lens are held in water. Refractive index of glass with respect to water is greater than refractive index of glass with respect to air. Therefore, when a convex lens is dipped into water, its focal length increases.