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

Question

Luna Gray

Physics

27 August, 16:50

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

+4

Answers (1)

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Rolando Choi · Answer 1

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.

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. 2λfilmB. λfilmC. λfilm/2D. λfilm/4

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