A thin film of thickness 1.5 µm is placed in Michelson interferometer which causes a 7.5 fringe shift in the interference pattern. The film is removed and replaced with another made of the same material which causes a shift of 9.0 fringes. Both shifts are relative to the pattern when no film was inserted. What is the thickness (um) of the second film?

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Diffraction of light

In physics, the term diffraction is defined as the bending of light around the corners of the obstacle. As a light ray passes by an aperture, it bends around the edges or through slits, it spreads out through a narrow opening. The diffracted light will produce fringes of bright and dark or colored bands which are labeled as a diffraction pattern.