. Light, a textbook for students who have had one year of physics. INTERFERENCE IN THIN FILMS 153. light passing through the upper half of the biprism is bentdownward, that through the lower half upward, so* that the light comes to the screen asif it came from two pointsX and Y, which may be re-garded as virtual images ofthe real slit S, formed by re-fraction through the upperand lower halves of the bi-prism respectively. Wherethe two beams overlap nearFisure 79 the center of the white screen, interference fringes are produced. 76. Interference in thin uniform films.—Nature herselfprovides us
. Light, a textbook for students who have had one year of physics. INTERFERENCE IN THIN FILMS 153. light passing through the upper half of the biprism is bentdownward, that through the lower half upward, so* that the light comes to the screen asif it came from two pointsX and Y, which may be re-garded as virtual images ofthe real slit S, formed by re-fraction through the upperand lower halves of the bi-prism respectively. Wherethe two beams overlap nearFisure 79 the center of the white screen, interference fringes are produced. 76. Interference in thin uniform films.—Nature herselfprovides us with the tin est cases of interference, in the beauti-ful iridescent coloring of soap-films, films of oil on water, fis-sures in the interior of crystals, etc. In all such cases, it isfound that there are two reflecting surfaces separated by avery small distance, and the interference is between the lightreflected from the first surface and that reflected from thesecond. It is further necessary, if the colors are to be seenanywhere but in certain particular spots when the eye happensto be in
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectlight, bookyear1921
