Question

For a colour of light the wavelength of air is 6000A and in water the wavelength is 4500A.then speed of light in water will be

Answer 1

$\frac{wavelength of light in air }{wavelength of light in medium} = \frac{velocity of light in air}{velocity of light in medium}$

$\frac{6000}{4500} = \frac{3X10^{8} }{y} \\ y=2.25 X 10^{8} ms ^{-1}$