Rectilinear propagation of light, or the principle that light travels in straight lines, is a fundamental concept in ray optics and holds true when the medium is uniform and has a constant optical density (homogeneous) and allows light to pass through (transparent).
Light travels in a straight line (rectilinear propagation of light). This statement does hold if the medium of travel for light is
Asked in UPSC CDS 2 2016 · Topic: Optics (Reflection and Refraction at plane and spherical surfaces)
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