Now this film is on a sheet of glass, with n = 1.47. What is the wavelength of t

Question

Now this film is on a sheet of glass, with n = 1.47. What is the wavelength of the light in air that will now be predominantly reflected?

A thin film of soap with n-1.42 hanging in the air reflects dominantly red light with = 649 nm. What is the minimum thickness of the film? 1.143x102 nm You are correct. Previous Tries Now this film is on a sheet of glass, with n predominantly reflected? 1.47. What is the wavelength of the light in air that will now be What changed compared to previous problem? What is the requirement for a maximum for the pathlength difference now? Submit Answer Incorrect. Tries 3/20 Previous Tries

Explanation / Answer

In the second case, there is a phase change between reflected waves of pi radians. The wavelength is now half of the previous wavelength.

To calculate is to use wavelength = 2*n*t ( t = thickness)

2*1.47*1.143*102 = 336.04 nm

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