How many images will be formed when an object is placed between two parallel plane mirror with their reflecting surfaces are facing each other? Why do more distant images appear fainter?
If an object is placed in between two parallel plane mirrors, infinite images are formed. Therefore, if a candle is placed between 2 mirrors placed parallel to each other, infinite images are formed, whatever the distance it between the mirror and the object.
As the object is kept between the two mirrors, it undergoes multiple reflection to produce the distant object. At each reflection, the intensity of the incident light gets lost due to the absorption phenomena. Each reflected beam has lesser energy than the incident. Hence, the distant images get fainter and fainter.