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L36_a - INTERFERENCE DUE TO THIN FILMS(27.4 in text Index...

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Unformatted text preview: INTERFERENCE DUE TO THIN FILMS (27.4 in text) Index of refraction v c n = : • important property of transparent material o c is the speed of light in vacuum (or air) o v is the speed of light in the transparent material o n > 1 for most transparent materials o n = 1 for vacuum and air Light can reflect from a boundary between two transparent materials • i.e. a boundary where n changes sharply PHASE CHANGE of a light wave due to REFLECTION : • EXTERNAL REFLECTION (i.e. from outside surface of material) o n 1 < n 2 o 180° (i.e. π ) PHASE CHANGE on reflection of em wave • INTERNAL REFLECTION (i.e. from inside surface of material) o n 1 > n 2 o NO PHASE CHANGE on reflection of em wave n 2 n 1 n 2 n 1 REFLECTION FROM A THIN FILM: INTERFERENCE EFFECTS Light from external reflection (1) and internal reflection (2) can interfere Q. What is (effective) path difference between (1) and (2)? • measure difference in wavelengths (important) • get constructive interference is (effective) path difference is an integer...
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L36_a - INTERFERENCE DUE TO THIN FILMS(27.4 in text Index...

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