light travels in straight line , why so...
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LIGHT TRAVELS IN A STRAIGHT LINE BECAUSE FILLS OUT WHOLE SPACE BEFORE HITTING ANY OBJECT, AND A SHADOW FORMS.
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Explanation:
Light travels in straight lines
Once light has been produced, it will keep travelling in a straight line until it hits something else. ... Light fills up all of the space before it hits the object, but the whole region between the object and the surface is in shadow.
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