Reflected light from a thin film of oil gives constructive interference for light with a wavelength inside the film of λfilm. By

Question

3 years ago

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Reflected light from a thin film of oil gives constructive interference for light with a wavelength inside the film of λfilm. By

how much would the film thickness need to be increased to give destructive interference?
A. 2λfilm
B. λfilm
C. λfilm/2
D. λfilm/4

Physics

1 answer:

My name is Ann [436] · Answer 1 · 2022-05-16T16:48:34+03:00

Answer:D. λfilm/4

Explanation: Destructive interference is a type of wave interference which means the coming together or over-lapping of two opposing waves creating No effect or the Cancellation of the wave impact. An example of destructive wave is when Noise cancel the effect of sound from a head phone.

The film thickness will need to be increased by λfilm/4 for it to be able to give a destructive interference.