Physics for Grammar Schools |
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Page 97 - ... perpendicular ; it simply retraces its own course. If it strike the surface obliquely, it is reflected obliquely. 53. Draw a perpendicular to the surface at the point where the ray strikes it; the angle enclosed between the direct ray and this perpendicular is called the angle of incidence. The angle enclosed by the reflected ray and the perpendicular is called the angle of reflection.