How does focal length of s lens change when red light incident on it is replaced by violet light? Give reasons for your answer.
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focal lenghth decreases because violet has more wavelength n wavelenth is inversely proportional to refractive index n refractive is inversely proportionally to focal length
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Focal length of the convex lens increases with the increase in wavelength. We know wavelength of red is more than the wavelength of violet. So, as the wavelength decreases the focal length also decreases.
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