A light wave has a frequency of `4xx10^(14)Hz` and wavelength on a water `[n_(w)=(4)/(3)]` interface. The critical angle of incidence is ___________.

Explanation

Here `v=4xx10^(14)Hz and lambda=500 nm =5xx10^(-7)m`
`rArr" "v=upskon lambda=4xx10^(14)xx5xx10^(-7)=2xx10^(8)ms^(-1)`
`rArr" "n=(c)/(v)=(3xx10^(8))/(2xx10^(8))=1.5`