When red light passing through a convex lens is replaced by light of blue color, how will the focal length of the lens change?Please explain in detail.
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If the front surface is flat, there will be little change in focal length whether immersed in water ... straight light ray pass from glass to water at the right side of lens the refractive index
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The refractive index of the material of a lens increases with the decrease in wavelength of the incident light. ... Thus, when we replace red light with a violet wavelength decrease and hence the focal length of the lens also decrease
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