Question

what does the phrase 'normal incidence' mean? what are i and r in this case?​

Answer 1

Answer:

Normal incidence is the condition in which a wave-front is parallel to an interface, such that the ray path is perpendicular (normal) to the surface. The angle of incidence is zero.

The condition in which wave path is parallel to an interface,such that path is perpendicular to surface.

Answer 2

Answer:

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