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Multiple Images formed by a Plate-glass Mirror

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-448

2025-12-17

383

When light from any source, as the point P (Fig. 1), falls upon a plate-glass mirror, two images will be formed: one at P' from the upper surface MM', and one at P" from the lower surface N N'. The image P' is generally faint, as but little of the light striking MM' is reflected "from that surface, the most of it passing through to the surface NN', from which, as the glass has a mercury back, it is nearly all reflected. The reason for the bending of the ray at A and C will be explained under the subject Refraction.

By holding a lamp close to a plate-glass mirror and looking at its image in a slanting direction several images will be seen. Two of these are like P' and P" (Fig. 1); the others are due to rays striking the mirror at the left of A and emerging at the right of C after several reflections between NN' and MM'.