Which property of concave mirror is used by dentist?

Which property of concave mirror is used in making the solar cooker?

Which of the following mirrors is used by dentists

What is a concave mirror ?

The mirror used by ENT specialists is

Ramu observed a mirror which is used by dirvers to see the vehicles behind. Srinu observed a mirror which is used by dentist to see teeth inside the mouth. What are those two mirrors and distinguish them ?

Assume that an object is kept at a distance of 20 cm in front of a concave mirror. If its focal length is 30 cm then What is the magnification of mirror in this case ?

Concave mirror is part of……..