For incidence to be normal, the angle must ________.

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Multiple Choice

For incidence to be normal, the angle must ________.

Explanation:
Normal incidence means the incoming ray is perpendicular to the surface. When you measure the angle with respect to the surface, a line that is perpendicular forms a 90-degree angle with the plane. So to be normal, the angle must be exactly 90 degrees. An angle smaller than 90 would be oblique incidence, and angles greater than 90 aren’t used for describing the line–plane angle in this context.

Normal incidence means the incoming ray is perpendicular to the surface. When you measure the angle with respect to the surface, a line that is perpendicular forms a 90-degree angle with the plane. So to be normal, the angle must be exactly 90 degrees. An angle smaller than 90 would be oblique incidence, and angles greater than 90 aren’t used for describing the line–plane angle in this context.

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