Refraction of light
Light travels in a straight line but when it enters another
medium it would be seen to bend.
How does a lens work?
A lens is a plastic or glass, which refracts light to form
an image. When we look through a lens it will seemed like it was distorted.
This because light undergoes refraction as it travels from air to glass and
back to air again. Lenses are usually used to magnify objects. The examples are
magnifying glass, microscopes, spectacles, cameras and telescopes.
Dispersion of light through a prism
White light is actually made up of different colours. We can
prove this by shining white light to a prism, a a transparent plastic or glass
object with smooth surfaces and can refract light. It occurs because, light
travels at different speeds and the different colours refract at different
angles as they pass through a prism.
Dispersion of light through water droplets
Water droplets can also act like a prism. The water droplets
refract on sunlight.
Transfer of Heat
Conduction: Heat is transferred from one object to another.
The example is, from the heat of boiling water to a spoon.
Convection: The transfer of heat from one region to another
by the movements of fluids. The example is, from cold water to hot water.
Radiation: It is the release of heat from the surface
