science
Grade-4-
Easy
Question
Hint:
The angle of incidence is equal to the angle of reflection.
The law of reflection defines that upon reflection from a smooth surface, the angle of the reflected ray is equal to the angle of the incident ray, with respect to the normal to the surface that is to a line perpendicular to the surface at the point of contact.
The angle which the light ray made with the perpendicular to the surface after reflecting off it is found to be 78 degrees. The angle at which it had hit the surface would be 78 degrees.
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