Reflection
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-443
2025-12-16
18
Demonstration. -Through a small hole in the shutter of a darkened room admit a ray of sunlight. Lay a mirror in its path and scatter crayon dust or smoke in the air. A large part of the light is reflected. Observe that the reflected ray is straight and that its direction depends upon the angle at which the ray strikes the mirror.
In Fig. 1, if L is the source of light, MM' the reflecting surface, P the point at which a ray of light strikes it, and PH the normal or perpendicular to the reflecting surface at the point P, then LP is called the incident ray, PB the reflected ray, the angle LPH the angle of incidence, which is the angle between the perpendicular HP and the incident ray, and BPH the angle of reflection.
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