Light
In our day to day life we use number of optical
instruments. Microscopes are inevitable in physics laboratory, biology
laboratory and in medical laboratories. Also telescopes, binoculars, cameras
and projectors are used in educational, scientific and entertainment fields. Do
you know the basic components or parts used in these instruments? Mirrors and
lenses! You can name some more optical instruments you have seen. Also, in our
daily life we come across many optical illusions like mirage, rainbow, apparent
bending of objects placed in liquids.
In this chapter, you will learn about the
properties of plane mirror and spherical mirrors (concave and convex). Also you
will learn about the properties of light, namely reflection and refraction and
their applications.
Light is a form of energy and it travels in the
form of electromagnetic waves. The branch of physics that deals with the
properties and applications of light is called optics. The branch of optics that treats light as rays is named ray optics or geometrical
optics and the branch of optics where the wave nature of light is
considered is called wave optics.
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