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The Reflection of Radiant Heat

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-257

2025-12-29

744

The Reflection of Radiant Heat. - Experiment proves that radiant heat is reflected in accordance with the following laws.

1. The incident and reflected rays are in a plane that is perpendicular to the reflecting surface.
2. The angle of reflection is equal to the angle of incidence.

 Demonstration. - Place two concave mirrors directly opposite each other, as at M and M' (Fig. 1). In the focus of M place, the radiometer and in the focus of M' place an iron ball heated nearly to redness. Have the mirrors far enough apart so there will be no rotation due to direct radiation from the ball. When the ball and the radiometer are in the foci of their respective mirrors, the radiometer will set up a brisk rotation due to reflected radiation.