White light is a mixture of light of wavelengths between 400 nm and 700 nm. If this light goes through water `(mu = `1.33)` what are the limits of the wavelength there ?

Explanation

When a light having wavelength `labda_0` in vacuum goes through a medium of refractive index `mu,` the wavelength in the medium becomes `lambda = lambda_0//mu.`
For `lambda_0=400, lambda = (400nm)/(1.33) = 300 nm`
and for `lambda_0 = 700nm, lambda = (700)/(1.33) = 525nm.` thus the limits are 300 nm and 525 nm.