why light travel in straight line
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Once light has been produced, it will keep travelling in a straight line until it hits something else. Shadows are evidence of light travelling in straight lines. An object blocks light so that it can't reach the surface where we see the shadow that's why light travel in straight line
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light travels in a straight line because it generally doesn't interact with a medium but if it interacted , it changes it path which is usually called refraction (interaction and bending of light)
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