00:02
Hello guys and this problem we cover the concept of interference in reflection due to a thin film.
00:11
Okay, now for the first reflection at the air and the film interface, the refractive index of the film is greater than the refractive index of the air, that is the incident medium.
00:33
So there will be no change in phase in the reflected ray of light.
00:36
For the second reflection, the refractive index of the reflecting medium glass is greater than the refractive index of the film.
00:51
Then again, there will be no change in phase for the second reflection.
00:58
For constructive interference, the part difference delta l should be equivalent to integral multiple of the wavelength for the two ray of light initially in the same phase.
01:20
And the path difference equals two times the restuctive index.
01:25
Of the film times the thickness...