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If the wavelength of a monochromatic bea...

If the wavelength of a monochromatic beam of light in air is 5000 `Å`, what is its wave number in SI units in glass of refractive index `1.5`?

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`""_(a)n_(s)= (lambda_(n))/(lambda_(s))`
`therefore` The wave length in glass , `vecv_(g) = 1/(lambda_(g))= (""_(a)n_(g))/(lambda_(a)) = 1.5/(5 xx 10^(-7)) = 3 xx 10^(6) m^(-1)`
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