
Concept explainers
(a)
The thickness of the soap film.
(a)

Answer to Problem 81P
The thickness of the soap film is
Explanation of Solution
The ray reflected from the front of the film will be reversed in phase because the refractive index of air is less than that of the film.
The ray reflected from the back of the film will not be inverted since the film has higher refractive index. The two reflected rays are
Missing wavelengths in the reflected light are caused by destructive interference, which occurs when the path length difference is equal to an integral multiple of the wavelength in the film. The reflections in the film are shown in Figure 1.
Write the condition of path length difference in the system for normal incidence.
Here,
Write the expression for the wavelength of light in the film.
Here,
Use equation (II) in (I).
Since
Use
Replace
Conclusion:
Substitute
Substitute
Therefore, the thickness of the soap film is
(b)
Whether there are any other missing visible wavelengths from the reflected light, and their wavelengths.
(b)

Answer to Problem 81P
There is missing visible wavelength in the reflected light and it is
Explanation of Solution
The missing wavelengths of
Conclusion:
Substitute
Substitute
Substitute
Among the obtained values of the missing wavelengths, the wavelength of
Therefore, there is missing visible wavelength in the reflected light and it is
(c)
The wavelengths of light that are strongest in the transmitted light.
(c)

Answer to Problem 81P
The wavelengths of light that are strongest in the transmitted light are
Explanation of Solution
The wavelengths that are strongest in transmitted light are the wavelengths that are missing in the reflected light. For the visible region of the
Conclusion:
Therefore, the wavelengths of light that are strongest in the transmitted light are
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Chapter 25 Solutions
Physics
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