What is the smallest thickness d of a soap film (n= 1.42) that gives a maximal r

Question

What is the smallest thickness d of a soap film (n= 1.42) that gives a maximal reflection if illuminated by a green light (Wavelength=700 nm)? (Use the interference condition for the light reflected from the top and bottom sides of the film, taking into account the possible wavelength/2 phase change upon reflection). What is the smallest thickness d of a soap film (n= 1.42) that gives a maximal reflection if illuminated by a green light (Wavelength=700 nm)? (Use the interference condition for the light reflected from the top and bottom sides of the film, taking into account the possible wavelength/2 phase change upon reflection).

Explanation / Answer

For constructive interference

thickness tmin =/4n

where refractive index of film n =1.42

wavelength =700 nm

substitute the given data in above equation we get

t =123.24 nm

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