Does Light Always Travel in a Straight Line?


Light always travels in a straight line until and unless a medium is applied to it. When a beam of light crosses the boundary between a vacuum and another medium, the wavelength of the light changes. The refractive quality of lenses is frequently used to manipulate light.
Q&A Related to "Does Light Always Travel in a Straight Line?"
it may be that when it travels it is not changing its medium but when changed the process is called refraction.
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