A convex lens is dipped in water what is the change in its focal length
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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.
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The focal length of the concave mirror does not change when it is immersed in water because focal length of a mirror does not depend upon the refractive index of the medium.
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.
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