1.If a thin film of soap (n = 1.39) hanging in air reflects predominantly red light ofwavelength 681 nm, what is the minimum thickness of the film?Answer:Not yet correct, tries 1/15Submit All AnswersHint: 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 thatwill be predominantly reflected?Answer:Submit All Answers

Concept: To determine the film's minimum thickness, we will use the concept of Constructive…

Answered: 1. If a thin film of soap (n = 1.39)…

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