Wright, Mark R., 1854- · London : Longmans · leaf 102
te wax. A beam of light is deflected by a mirror,M, so that it strikes L at the foot of the rod ; it is reflected in thedirection NR. A cardboard semicircle of i ft. radius is dividedinto degrees. It can always be so arranged that the rays mn andNR, and the rod No lie in the plane of the… … The ray that strikes the glass, is called the incident ray;the ray that is reflected, the reflected ray. A line perpen-dicular to a surface at a point, is called the normai at thatpoint; it is represented by the line n o. The angle mno, which the incident ray makes with thenormal, is called the…
Physics
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