[ف.نووي]

Monochromatic light ( = 500 nm) is incident on a soap bubble (n = 1.40). What is the wavelength of the light (in nm) in the bubble film?
a. 255 b. 500 c. 700
d. 357
e. 422
solution:

the wavelength of light in medium whose refraction index is n is
λ_n=λ/n=(500 nm)/(1.40)=357 nm