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Make your own mirror. Take a glass strip...

Make your own mirror. Take a glass strip or glass Slab. Clean it and put it on a white sheet of paper. See yourself in the glass. Next put the glass slab on a black sheet of paper. Again look into the glass. In which case do you see yourself better and why?

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You can see yourself better when the glass slab is kept on the black sheet of paper. This is because black colour being a good absorbers of light does not allow light to transmit through the glass slab. Most of the light gets reflected back by the glass slab and so, we see a clear image.
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