Abstract
SOME striking new interference phenomena have been found with Newton's rings by using multiple-beam interference instead of the usual two beams. The rings, formed between a convex lens and a flat piece of glass, are modified profoundly by the employment of multiple beams. The two surfaces in contact are coated (by evaporation in vacuo) with high reflecting coefficient transparent silverings, the reflecting coefficient exceeding 0·85 for the green mercury line. The resulting multiple beams lead to the production of fringes which are characterized by their remarkable sharpness. The fringes in transmission are fine narrow brilliant rings on a broad dark background, and in reflexion canbe seen a complementary system of fine dark 'absorption' fringes on a broad bright background.
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