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 L and 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. 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

thickness d=L

refractive index n=1.5

time t=distance /speed

speed v= lamda * f / n

time t= (L*n)/(lambda * f)

lambda =L/10

therefore time t= 15/f

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