A monochromatic beam of light of wavelength `lambda` and frequency `v` goes from vacum to a medium of refractive index n. How do the wavelength and frequency of light change ?

Options

A. wavelength becomes `(lambda)/(n)` and frequency nv
B. wavelength becomes `n lambda` and frequency becomes `(v)/(n)`
C. wavelength and frequency do not change
D. wavelength becomes `(lambda)/(n)` and frequency does not change

Answer

D

Explanation

Frequency does not change
`n = (lamda)/(lamda_(m))`.