A glass plate, which is polished on both the surfaces is `perfectly' transparent to light and so one can see through it. However if one of the surfaces is sand blasted to get a frost glass, this rough surface would scatter almost all the light in all directions.
Therefore light entering one side of the glass plate is totally scattered and lost and thus is not able to pass through. So we cannot see through. If one of the surfaces is mirrored then too one cannot see through but in this case the light is not scattered but completely reflected off and one would then see it as a shiny mirror.
Courtesy : The Hindu
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