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Will the focal length of a lens for red ...

Will the focal length of a lens for red light be more, same or less than that for blue light ?

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From lens maker's formula `(1)/(f) = (mu - 1)((1)/(R_1) - (1)/(R_2))`
AS `mu_b gt mu_r :. f_b lt f_r` or `f_r gt f_b`
i.e., focal length of a lens for red light will be more than the focal length of lens for blue light.
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