A plane mirror is held at a height h above the bottom of an empty beaker. The beaker is now filled with water upto a depth d. The general expression for the distance from a scratch at the bottom of the beaker to its image in terms of h and the depth d of water in the beaker is -
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If the water is filled through depth 'd' & scratch is at the bottom then the apparent depth of scratch is given by d app = 
and now the final image of this new image behaving like an object through the plane mirror is formed at equal distance behind the mirror.
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