because a concave mirror when inside the focal lengh(close up) enlarges the image. In this case it would make the teeth much easier to see
To reflect a larger amount of... stuff.
because when a man stands between the pricipal focus and pole of a concave mirror , he sees enlarged ,erect and virtual image of his face .that is why concave mirror of large focal length is used for...
it is used as the backing reflector for the bulb. because it is concave, the light that hits it is focused into a beam of light.
this question is wrong