When light falls on a surface, a part of it reflects back. If
light falls on a polished and shiny surface, most of its part reflect back in
the same medium. There are two types of reflection of light ?
(i) regular reflection and
(ii) irregular reflection or diffused reflection.
Regular reflection takes place when a ray of light is incident on
a polished smooth surface like a mirror. Here the reflected ray of light moves
only in a fixed direction.
Irregular reflection or diffused reflection takes place when a
ray of light is incident on a wall or wood, which is not smooth or polished.
In case of irregular reflection, the different portions of the
surface reflect the incident light in different directions and thus no definite
image is formed, but the surface becomes visible. It is commonly known as
scattering of light.
Light always follows the law of reflection, whether the
reflection occurs off a curved surface or off a flat surface. Two laws of
The angle of
incidence is equal to the angle of reflection.
reflected ray and the normal drawn at the point of incidence to the reflecting
surface, lie m the same plane.
Image formed by a plane mirror is laterally inverted i.e. the
left of the object appears in right and the right of the object appears in
Multiple images are formed when two plane mirrors inclined to
A kaleidoscope is a cylinder made with two or more mirrors. Light
reflecting between these mirrors produces multiple virtual images of stunning
Sunlight, called white light, consists of seven colours.
When white light is made to pass through prism, it splits into
its constituent colours. This phenomenon is known as dispersion.
Eye is an important organ which helps us in seeing the beauty of
nature. The important parts of the eye are cornea/ iris, pupil, lens, retina
and optic nerve.
Retina contains two types of nerve cells ?