A beam of light from a monochromatic laser shines into a piece of glass. The gla

Question

A beam of light from a monochromatic laser shines into a piece of glass. The glass has thickness Land index of refraction n=1.5. The wavelength of the laser light in vacuum is L/10 and its frequency is f. In this problem, neither the constant c nor its numerical value should appear in any of your answers.

Part A

How long does it take for a short pulse of light to travel from one end of the glass to the other?

Express your answer in terms of the frequency, f. Use the numeric value given for n in the introduction.

Explanation / Answer

The speed of light, equals the wavelength times the frequency c = (L/10) * f

t = L / ((L/10) * f)

t = 10 / f

Index of refraction in the medium = 1.5

Wavelength will be lowered by a factor of 1.5 (L / 15)

t = L / ((L/15) * f)

t = 15 / f

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