Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of refracted light? Refractive index of water is 1.33.

Explanation

a. `lamda=589xx10^(-2)m,c=3xx10^(8)m//s` (air)
`:.` Frequency `v=c/(lamda)=(3xx10^(8))/(589xx10^(-9))=5.09xx10^(14)Hz`
No change for `lamda` and c
b. Frequency remains the same
Wavelength `lamda.=(lamda)/n=(589nm)/1.33=443nm`
Speed `v.=c/n=(3xx10^(8))/1.33=2.26xx10^(8)m//s`