A thin film of oil (n = 1.46) is floating on a water surface (n = 1.33) and is illuminated from above by monochromatic light (λ = 600 nm). For what thickness of the oil film will the reflected light be bright? (in nm)

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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.