Physics of Everyday Phenomena
Physics of Everyday Phenomena
9th Edition
ISBN: 9781259894008
Author: W. Thomas Griffith, Juliet Brosing Professor
Publisher: McGraw-Hill Education
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Chapter 16, Problem 4SP

A certain soap film has an index of refraction (see synthesis problem 1) of n = 1.4. This implies that the wavelength of light in the film is shorter than in air by a factor of 1/n. The index of refraction of air is approximately 1.0, so there is little difference between the wavelength in air and that in a vacuum.

a.    If light with an air or vacuum wavelength of 693 nm enters a soap film, what is the wavelength of this light in the film?

b.    If the film is 1980 nm thick, how many wavelengths farther does the wave reflected from the bottom surface of the film travel than that reflected from the top?

c.    Would you be surprised to find that this thickness produces destructive interference for reflected light?*

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Light with a wavelength of 500 nm is normally incident on a film (i.e. the uppermost film) with an index of refraction of 1.60. Above the uppermost film is air. The uppermost film rests on top of a glass surface with an index of refraction of 1.66. a. What is the wavelength of the light in the uppermost film, the one with an index of refraction of 1.60? b. In part (a), what is the smallest (nonzero) thickness t of the uppermost film which would marimize the intensity of reflected 500 nm light? c. In part (a), what is the smallest (nonzero) thickness t of the outer film which would minimize the intensity of the reflected 500 nm light?
a.a A 30 km long optical fibre has an attenuation of 0.8 dB/km at 1300 nn. Find the optical power launched into the fibre If the output power Is 200 uW. (6) 3.4 Determine the total delay time in a 1 km long fibre with a core refractive index of 1.46, refractive Index difference of 1 % operating at a wavelength of 820 nm and AN 40 nm. (5)
Q. A light of wave length 6000A0 in air enters a medium with refractive index 1.5. what will be the frequency and wave length of light in medium?

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Physics of Everyday Phenomena

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