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In: Physics

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

Which of the following experiments will produce constructive interference at the point of view of the observer (eye). The index of refraction of the soap film is 1.25 and there is air above the soap film. In experiments I) (t=300 nm) and III) (t=250 nm) there is air below the soap film, but in experiment II) (t=100 nm) there is a glass with index of refraction equal to 1.5. Assume that in all cases the light is nearly normal to the surface and that the light 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 all cases. Which of the following is true?

  1. The light intensity that is transmitted beyond the soap is independent of whether there is constructive or destructive interference at the eye position because it is fixed by the law of refraction.

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

  • A and C.

  • The light intensity that is transmitted beyond the soap is larger when there is destructive interference at the eye position.

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