APFIVE Refraction Effects on Wavelength and Phase
Two coherent light waves of wavelength 500 nm in vacuum enter a thin film (n=1.40) at normal incidence. How does refraction affect the wavelength and phase relationship between these waves?
A
Wavelength and phase both change
B
Neither wavelength nor phase is affected
C
Wavelength shortens but phase remains continuous
D
Wavelength remains the same but phase shifts
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