Which of the following experiments will produce constructive interference at the point of view of the...

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Physics

Which of the following experiments will produce constructiveinterference at the point of view of the observer (eye). The indexof refraction of the soap film is 1.25 and there is air above thesoap film. In experiments I) (t=300 nm) and III) (t=250 nm) thereis air below the soap film, but in experiment II) (t=100 nm) thereis a glass with index of refraction equal to 1.5. Assume that inall cases the light is nearly normal to the surface and that thelight has 400 nm wavelength in the soap film.

A. None

B. Experiment I only

C. Experiment II only

D. Experiment I and III only

Assume that the light intensity is the same in allcases. Which of the following is true?

  1. The light intensity that is transmitted beyond the soapis independent of whether there is constructive or destructiveinterference at the eye position because it is fixed by the law ofrefraction.

  • The light intensity that is reflected to the eye can bechanged by adding another material (coating) with appropriatethickness and index of refraction.

  • A and C.

  • The light intensity that is transmitted beyond the soapis larger when there is destructive interference at the eyeposition.

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