What Is Inferior Mirage And Superior MirageMirage or Inferior MirageDefinition: It is an optical illusion, seen in deserts at summer noon, due to which an inverted image of a distant tree is seen formed in hot sand below it, as if formed in water. Actual…

How A Rainbow Is FormedA rainbow is a natural spectrum appearing in the sky after a rain shower. It is caused by dispersion of sunlight by tiny water droplets, present in the atmosphere. A rainbow is always formed in a direction opposite to that of the S…

What Are The Defects Of VisionThe major defects of vision are:Short sightedness or myopia.Long sightedness or hypermetropia.PresbyopicAstigmatism1. Short sightedness or myopiaSymptoms: Eye cannot see clearly beyond a certain distance. It means that the f…

Dispersion Of White Light By A Glass PrismWhat happens when light falls on the surface of a compact disc (CD) or a prism? We see that when light falls on a CD or. a prism, it splits up into its many colours. The process of splitting up of white light int…

How The Human Eye WorksHuman eye is the most delicate and complicated natural optical instrument which enables us to see the wonderful world of light. Diagram shows the section of a human eye by a horizontal plane. It is a spherical ball of diameter ab…

Power Of Accommodation Of EyeThe ability of the eye lens to adjust its focal length is called accommodation. However, the focal length of the eye lens cannot be decreased below a certain minimum limit. To see an object comfortably and distinctly, you mus…

What is meant by Atmospheric Refraction?We can observe the apparent random wavering or flickering of objects seen through a turbulent stream of hot air rising above a fire or a radiator. The air just above the fire becomes hotter than the air further up.…

What Is Scattering Of LightThe interplay of light with objects around us gives rise to several spectacular phenomena in nature. The blue colour of the sky, colour of water in deep sea, the reddening of the sun at sunrise and the sunset are some of the w…