Light of wavelength x, in air, is incident in air on a film of oil with index of refraction n_oil = 1.45. The film of oil has thickness L, and is spread on glass with an index of refraction n_glass = 1.50.
The wavelength of the light in oil will be _____ than the wavelength of the light in glass.
A) greater than B) equal to C)less than
2*n_oil*L = m*x
The Attempt at a Solution
I know the answer is A, but I can't figure out why. Can someone help me out on this? Thanks.