The figure shows four situations in which light reflects perpendicularly from a thin film of thickness L, with indexes of refraction as given. (a) For which situations does reflection at the film interfaces cause a zero phase difference for the two reflected rays? (b) For which situations will the film be dark if the path length difference 2L causes a phase difference of 0.5 wavelength?

The figure shows four situations in which light reflects perpendicular

1.	The figure shows four situations in which light reflects perpendicularly from a thin film of thickness L, with indexes of refraction as given. (a) For which situations does reflection at the film interfaces cause a zero phase difference for the two reflected rays? (b) For which situations will the film be dark if the path length difference 2L causes a phase difference of 0.5 wavelength?
Answer» SOLUTION :(a) 1 and 4, (B) 1 and 4

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