Which type of mirror could be used as a dentist's mirror?

Draw the following diagram in your answer book and show the formation of image of the object AB with the help of suitable rays :

Draw the following diagram in your answer book and show the formation of image with the help of suitable rays:

Which kind of mirror is used in the headlights of a car? Why is it used for this purpose?

Explain why, a ray of light passing through the centre of curvature of a concave mirror gets reflected back along the same path.