What, if any phase change occurs when light, traveling in air, reflects from the

Question

What, if any phase change occurs when light, traveling in air, reflects from the interface between the air and a soap film (n=1.33)???

What, if any, phase change occurs when light, traveling in a soap film, reflects from the interface between the soap film and a glass plate (n=1.52)??

Is the wavelength of the light in a soap film greater than, smaller than, or equal to the wave length in a vacuum

soap film (n=1.33) is 465 nm thick and lies on a glass plate (n=1.52). Sunlight whose wave lengths (in a vacuum) extend from 380 to 750 nm, travel through the air and strikes the film perpendicularly. For which wavelength(s) in this range does destructive interference cause the film to look dark in the reflected light.

Explanation / Answer

Slit separation d= 0.158 * 10 ^ -3 m Wavelength of red light ?= 665 nm = 665 * 10 6 -9m Wavelength of yellow ? ' = 565 * 10 ^ -9 m Distance of the screen fom slits D = 2.24 m Condition for 3rd oder dsin ? = 3? fromthis sin ? = 3? / d for red light : ------------ sin ? = 0.01262 ? = 0.7234 deg tan ? = 0.01262 y / D = 0.01262 y = 0.01262 D = 0.028285m for yellow light : ------------ sin ? = 0.01072 ? = 0.6146 deg tan ? = 0.01072 y ' / D = 0.01072 y = 0.01072 D = 0.02403m the distance on the screen between the third-order red fringeand third-order yellow-green fringe =y - y ' = 4.253 * 10 ^ -3 m

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