PDF chapter test TRY NOW

The image of an object placed at a point A before a plane mirror LM is seen at the point B by an observer at D as shown in the below figure. Prove that the image is as far behind the mirror as the object is in front of the mirror.
 
YCIND240505_6261_24.png
 
[Hint: CN is normal to the mirror. Also, angle of incidence = angle of reflection].
 
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Important!
This is a creative exercise. Your teacher will check it manually.