A film of soapy water (n = 1.33) on top of a plastic cutting board has a thickness of 230 nm. Part (a)  What is the longest wavelength (in nm) which undergoes constructive interference?  Part (b)  What color is this?

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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.