which of the following statement is incorrect light travels in a straight line light needs material medium for its propagation light travels faster than sound speed of light in vacuum is 300000 km/s
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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. 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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Light doesn't depends upon any medium so it can travel through vacuum.
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