Light traveling downward is incident on a horizontal film of thickness t , as sh

Question

Light traveling downward is incident on a horizontal film of thickness t, as shown in the figure (Figure 1) . The incident ray splits into two rays, A and B. Ray A reflects from the top of the film. Ray B reflects from the bottom of the film and then refracts back into the material that is above the film.

Light traveling downward is incident on a horizontal film of thickness t, as shown in the figure (Figure 1) . The incident ray splits into two rays, A and B. Ray A reflects from the top of the film. Ray B reflects from the bottom of the film and then refracts back into the material that is above the film. If the film has parallel faces, find the angle ? between the rays A and B. Express your answer in terms of the variables t, n1, n2, and n3.

Explanation / Answer

the angle ? between the rays A and B=zero degrees

the emergent rays are parallel

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