Temperature is measured using a

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

The distance between the pole and the principle focus is called

Heat energy can be transferred in

A centre of a spherical mirror is called the 

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

The shiny liquid metal in the thermometer is

Substances that are burnt to give heat are called

A very narrow tube in a thermometer is called a

Which of the following  is denoted by P.?