Question

What is angle of incidence of a ray if the reflected ray is at an angle of 90° to incidenct ray.​

Answer 1

Answer:

45

Explanation:

since angle of incidence=angle of reflection.

angle of incidence+ angle of reflection= 90

Therefore, angle of incidence = 45

Answer 2

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Answer:

If the reflected ray is at the angle of 90o to the incident ray, then the angle of incidence is 45°. According to the law of reflection, the angle of incidence and the angle of reflection are equal. Therefore, the angle of incidence and the angle of reflection both are $\frac{90}{2}$=45°