Concave mirror is used in 

Temperature is measured using a

A centre of a spherical mirror is called the 

In a concave mirror, if the object is at infinity then the image formed is  at

Heat is a form of

A spherical mirror in which the outer surface is reflecting is called a

The clinical thermometer is used to check when you have

The normal temperature of the human body is

A very narrow tube in a thermometer is called a

Substances that are burnt to give heat are called