Explanation:
constructive interference produces the colors in thin film
Energy in the form of light or electromagnetic radiation is emitted by the sun as photons. This radiation forms wavelengths called the electromagnetic spectrum (EMR) and an object’s color is indirectly related to light’s wavelength λ within the electromagnetic spectrum.
Thin films have a thickness a few times smaller than their corresponding wavelength. White light in the visible spectrum of the EMR contains all of the visible spectrum. As it strikes the surface, some of the rays bounce around, and travel further -thus they are no longer in phase. The slightly out of step waves join together; some waves overlap, and cancel each other out as white light (destructive interference), while others leave just a bit of light within the visible spectrum- you see colors of the remaining/leftover light reflected.
Different colors are seen with different thickness of films because of the ratio of its thickness, t to light’s wavelength. Bright colors seen in thin films are caused by light interference and the ones that appeared to be brightly colored are said to show constructive interference- where changes in phase (light wave patterns) that overlap occur. This occurs between the lights reflect reflected at the different thin film surfaces.
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