Fused quartz has an index of refraction of 1.55 for light from a 550-nm source.What is the speed of light for this wavelength within the quartz? (c = 3.00 × 10⁸ m/s) A) 1.55 × 10⁸ m/s B) 1.94 × 10⁸ m/s C) 2.41 × 10⁸ m/s D) 1.25 × 10⁸ m/s E) 1.45 × 10⁸ m/s

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Quizplus · Accepted Answer

The speed of light in a medium is given by c/n, where c is the speed of light in vacuum and n is the index of refraction of the medium. Therefore, the speed of light in fused quartz for a 550-nm source is:v = c/n = (3.00 × 10^8 m/s) / 1.55 = 1.94 × 10^8 m/s

Fused Quartz Has an Index of Refraction of 1