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Visible spectrum extends from 400nm (violet) to 750nm (red). Hence frequency ratio is

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$4 / 15$

$8 / 15$

$15 / 8$

$1 / 2$

answer is C.

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Detailed Solution

$v_{1} = \frac{c}{λ_{1}} = \frac{c}{400 nm}; v_{2} = \frac{c}{λ_{2}} = \frac{c}{750 nm}$

$\frac{v_{1}}{v_{2}} = \frac{c}{400} \times \frac{750}{c} = \frac{15}{8}$

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