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Use Huygens' principIe to show that a point object pIacecd in front of a pIane mirror produces a virtuaI image at the back of the mirror whose distance is equaI to the distance of the object from the mirror. |
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Answer» Solution :LET A be a point source of light a distance y from the plane merror MM . In absence of the mirror let the wavefront travel A ' in time t. But due to the presence of the mirror the REFLECTED wavefront will reach the point A in the same TIMEINTERVAL t. THUS AA' =ct (here , c=velocity of light) i.e AO +OA ' =ct Again AO+OA =ct `:.` OA =OA' 
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