What Is Inferior Mirage And Superior Mirage Mirage or Inferior Mirage Definition: 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. Actually there is no water anywhere.Fig. Mirage in hot desert–Inverted image of tree in hot sand Explanation: It is due to … [Read more...] about What Is Inferior Mirage And Superior Mirage
Human Eye and Colourful World
How A Rainbow Is Formed
How A Rainbow Is Formed A 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 Sun. The water droplets act like small prisms. They refract and disperse the incident sunlight, then reflect it internally, … [Read more...] about How A Rainbow Is Formed
What Are The Defects Of Vision
What Are The Defects Of Vision The major defects of vision are:Short sightedness or myopia. Long sightedness or hypermetropia. Presbyopic Astigmatism1. Short sightedness or myopia Symptoms: Eye cannot see clearly beyond a certain distance. It means that the far point of the defective eye has shifted from infinity to a finite distance ahead. Reasons: It is … [Read more...] about What Are The Defects Of Vision
Dispersion Of White Light By A Glass Prism
Dispersion Of White Light By A Glass Prism What 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 into many colours is called dispersion.The band of colours produced when white light is split up is called a spectrum. A … [Read more...] about Dispersion Of White Light By A Glass Prism
How The Human Eye Works
How The Human Eye Works Human 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 about 2.5 cm. The eyelids act as the shutters of the eye and protect them from injury. Internally the eye is made up of the … [Read more...] about How The Human Eye Works