A light of wavelength at 700nm falls almost perpendicularly on a thin film with index of refraction n₂. Below the film is an infinitely thick layer with index of refraction n a. If n₁1.5, n₂=1.8 and n3 = 2.5. What is the minimum non-zero film thickness to get destructive interference? b. If n₁1.5, n₂=1.8, n3 = 2.5. What is the minimum non-zero film thickness to get constructive interference? c. If n₁1.8, n₂=1.5 and n3 = 2.5. What is the minimum non-zero film thickness to get destructive interference? d. If n₁1.8, n₂=1.5 and n3 = 2.5. What is the minimum non-zero film thickness to get constructive interference?

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Question A6 It is desired to apply an anti-reflection coating on a glass lens used in air, by coating the lens with a thin film of magnesium fluoride of refractive index n = 1.37; (assume the glass has refractive index larger than nF). Write down the formula for optical path difference between waves reflected at top and bottom of the film, and use this to calculate the minimum required thickness of the coating to give a reflectance minimum for normal-incidence green light of wavelength 550 nm in air.

Physics 20: SUMMER Assignment 13 7. Use the following information and diagram to answer parts a and b. A reflecting surface is inclined 30° above the horizontal. A wave is traveling horizontally and reflects off the surface, as shown below. The solid grey line is the barrier and the black arrow is the wave. (1) (1) a) What is the angle of incidence? 30° 1 b) What is the angle between the incident ray and the reflected ray? 4