1. If a thin film of soap (n = 1.39) hanging in air reflects predominantly red light of wavelength 681 nm, what is the minimum thickness of the film? Answer:( Not yet correct, tries 1/15 Submit All Answers Hint: Remember the condition for an interference maximum for this situation (refraction off a medium with a larger index of refraction). Pathlength difference PD = 2t (m + 1/2)(lambda/n). What is the relation between PD and the thickness of the film? Is the wavelength in all media the same? 2. If this film is placed on a sheet of glass (n = 1.57), what is the longest wavelength that will be predominantly reflected?
1. If a thin film of soap (n = 1.39) hanging in air reflects predominantly red light of wavelength 681 nm, what is the minimum thickness of the film? Answer:( Not yet correct, tries 1/15 Submit All Answers Hint: Remember the condition for an interference maximum for this situation (refraction off a medium with a larger index of refraction). Pathlength difference PD = 2t (m + 1/2)(lambda/n). What is the relation between PD and the thickness of the film? Is the wavelength in all media the same? 2. If this film is placed on a sheet of glass (n = 1.57), what is the longest wavelength that will be predominantly reflected?
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If a thin film of soap (n = 1.39) hanging in air reflects predominantly red light of
wavelength 681 nm, what is the minimum thickness of the film?
Answer:
Not yet correct, tries 1/15
Submit All Answers
Hint: Remember the condition for an interference maximum for this situation
(refraction off a medium with a larger index of refraction). Pathlength difference PD =
2t (m + 1/2)(lambda/n). What is the relation between PD and the thickness of the film?
Is the wavelength in all media the same?
2.
If this film is placed on a sheet of glass (n = 1.57), what is the longest wavelength that
will be predominantly reflected?
Answer:
Submit All Answers"
Transcribed Image Text:1.
If a thin film of soap (n = 1.39) hanging in air reflects predominantly red light of
wavelength 681 nm, what is the minimum thickness of the film?
Answer:
Not yet correct, tries 1/15
Submit All Answers
Hint: Remember the condition for an interference maximum for this situation
(refraction off a medium with a larger index of refraction). Pathlength difference PD =
2t (m + 1/2)(lambda/n). What is the relation between PD and the thickness of the film?
Is the wavelength in all media the same?
2.
If this film is placed on a sheet of glass (n = 1.57), what is the longest wavelength that
will be predominantly reflected?
Answer:
Submit All Answers
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