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2) Refractive index is the ratio of the speed of light in vacuum to the speed of light in any given medium.

18 / 01 / 2019 Physics

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The interference is the phenomenon in wave optics of physics, where two waves having different wavelength combine together to form a wavelength of different amplitude (Berczynski, 2016, p.54). In CD, the incident laser lights interfere in the pit depth, where it gives a shining reflection. The minimum depth of the pit is of 195 nm. The thin film present in CD is responsible for a phenomenon called thin-film interference, which is caused by reflection of light waves of upper and lower boundary. The reflection depends on refractive index of the medium. Hence, the laser light can go at a minimum depth of 125.80 nm within the CD.
2) Refractive index is the ratio of the speed of light in vacuum to the speed of light in any given medium. The speed of the light generally goes down, when it enters an optically dense medium like oil (Tsai, 2013, p.112). Transparent and translucent things have high refractive index. Here, the given refractive index is 1.53. Hence, 
n = speed of light in vacuum/speed of light in the medium.


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