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Refraction

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-457

2025-12-25

719

Refraction- If a heavy pencil line is drawn on a sheet of paper and a piece of plate glass is laid over it the line seen through the glass will be a continuation of the part that the glass does not cover, as in (a), Fig. 1, provided the eye is directly in front of the line. If, however, it is on one side, the line will appear to be a broken line as in either (b) or (c).

The reason for this appearance is that the light coming from the line to the eye has its direction changed at the surface of the glass. This bending of the ray, called refraction, takes place whenever light passes obliquely from one medium into another of different optical density.