Question

silver is used to make good quality mirrors why

Answer 1

Because silver is shiny and is a good reflector. It reflects about 90 percent of light falling on it. That is why, it is used for making high reflecting mirrors.

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Answer 2

one surface of the mirror is silvered because it helps the light rays to reflect. if it is not polished the rays pass through the mirror. so silvering helps the rays to reflect properly.