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The focal length of converging lens is measured for violet, green and red colours. It is respectively fv, fg, fr, We will get
(a) fv = fg
(b) fg > fr
(c) fv < fr
(d) fv > fr
(c)
According to Cauchy relation
.''. Red light has wavelength greater than violet light.
Therefore focal length of lens for red is greater than for violet.
(fr > fv)
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