Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 411
e admitted toa darkened room through a narrow slit. The straight path of the beamwill be rendered visible by the brightly illumined dust particles sus-pended in the air. Let the beam fall on the surface of a mirror. Itsdirection will be seen to be sharplychanged, as shown in Fig. 377. Letthe mirror… … Fig. .377. Illustrating law ofreflection of light The experiment shows roughly,therefore, that the angle lOP, be-tween the incident beam and the normal to the mirror, is equal to the angle FOR, between the re-flected beam and the normal to the mirror. The first angle, lOP,is called the angle of…
Physics
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