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Concave mirrors are used by dentists to ...

Concave mirrors are used by dentists to examine teeth. why?

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As a dentist.s head mirror : You would have seen a circular mirror attached to a band tied to the forehead of the dentist/ENT specialist. A parallel beam of light is made to fall on The concave mirror, this mirror focuses the light beam on a small area of the body (such as teeth, throat etc.).
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