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When white light illuminates an oil film on water and the reflected light is viewed perpendicular...


When white light illuminates an oil film on water and the reflected light is viewed perpendicular to the surface of the water, no green light at 548 nm is reflected but there is a strong presence of red light with a wavelength of 685 nm. Determine the thickness of the oil film. Take the index of refraction of oil to be 1.28.

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Answer #1

In the given problem thickness of oil can be find using below formula

This the condition for destructive ineterference or minima or no reflection or Transmission.

Thickness of oil film, t= 214 nm(nano meters).

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