Q.) Which of the following mirror is used by
a dentist to examine a small cavity in a
patient’s teeth?
(a) Convex mirror
(b) Plane mirror
(c) Concave mirror
(d) Any spherical mirror
Ans. (c) Concave mirror
Explanation: Concave mirrors concentrates parallel rays of light on its focus and are therefore used by dentists to examine small cavities in patient’s teeth.
