When a beam of white light is passed through a prism, white light splits up into different colours. Consequently a coloured pattern is obtained on the screen. This...
Our eyeball is nearly spherical with white outer layer called the sclera. Here is a short description of how our eye works. Working of Human Eye The light...
Heat energy radiated by the earth changes the density of the atmospheric layers continuously. This changing density of the air layers near the ground affects its refractive index....
The image formed by the actual intersection of refracted rays through a lens is called the real image. The real images can be caught on the screen and...
A lens is a thin piece of a transparent material bounded by two spherical surfaces or by one spherical and other plane surface. The width or diameter of...
Humidity is the amount of water vapour present in atmosphere. The amount of water vapour in atmosphere changes with time and weather. The air containing water vapour is...
Matter exists in three states viz., solid, liquid and gas. The change from one state to another can be brought about by the application or withdrawal of heat....
Thermal expansion takes place in all states of matter. The gases expand more than liquids and liquids expand more than solids for the same amount of heat. Thermal...
Heat is the most common form of energy. Heat can be transferred from one place to another by means of conduction, convection and radiation. It can be converted...
