Athin film of oil of thickness t is floating on water. the oil has index of refraction no = 1.4. there is air above the oil. when viewed from the air in the direction normal to the surface, there is constructive interference of reflected red light with l = 675 nm. find the minimum thickness t of the oil film that will give constructive interference of reflected light with l = 675 nm.

t = 120.5 nm

Explanation:

given,    

refractive index of the oil = 1.4

wavelength of the red light = 675 nm

minimum thickness of film = ?

formula used for the constructive interference

where n is the refractive index of oil

t is thickness of film

for minimum thickness

m = 0

        t = 120.5 nm

hence, the thickness of the oil is t = 120.5 nm

terd muffin is the correct answer

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