why light travel in straight line
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An object blocks light so that it can't reach the surface where we see the shadow. 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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Because of the rectilinear propagation of light the light travel in straight line
Explanation:
If we take a straw an try to look at a lighted candle through it . You will be able to see the flame of the candle . Bend the straw in the middle and again try to observe the flame through You will not be able to see the flame This happens because light travel in a straight line and cannot bend around corners
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