In this article we will learn about the introduction of light.
We know about what is basic introduction of light.
Introduction of light
It is an agent which produces in us the sensation of sight. It itself is invisible but makes the other objects visible. It may be defined as the radiant energy which produces the sensation of light.
Ray of Light
For better understand introduction of light we need to know
about the ray of light.
It is a straight line path along which the transfer of light
energy takes place.
Pencil of light rays
It is a group of inclined rays of light diverging from a
point source or covering to another point.
Beam Of light
As shown in the figure the group of parallel rays is called
beam of light.
Divergent Rays
If rays of light are diverging from a point source so that,
distance between rays goes on increasing
as they move forward, then the group is called divergent rays as shown in fig.
Convergent Rays
If rays of light are converting to a point so that, the
distance between the rays goes on decreasing as they move forward, then the
group is called convergent rays as shown in fig.
Parallel Rays
If successive light rays keep equal distance through, then
they are parallel rays
In introduction of light these are different types of rays.
Image.
If pencil of diverging from a point O is caused by
reflection (or refraction) to coverage
or to appear to diverge from some other point I, then I is called image of the
object O.
Real Image
If reflected (or refracted) rays from first point appear to
meet at the second point, then the second point is called real image of first
point. Real image can be taken on the screen.
Virtual Image
If reflected (or refracted) rays from first point appear to
meet at the second point, then it is called virtual image of first point. It cannot
be taken on the screen.
Reflection of Light
In introduction of light these are also important point that
is reflection of light which means that how to reelect light.
It is bending of light to the first medium from the surface
of separation of the two media. The rays are sent back by this process. The phenomenon
of reflection of light is shown in figer.
Thus, the process of sending back the light rays which fall
on the surface of an object is called reflection of light.it is basic introduction
of light.
Incident Ray
The ray of light originating from the source and falling on
the surface of mirror shwoing the incident ray.
Point of Incidence
It is the point at which the incident ray comes in contact
with the mirror. mid point is the incident point.
Reflected Ray
The ray of light which is sent back by the mirror is called
reflected ray.
The normal is a line at right angles to the mirror surface
at the point of incidence. NO is the normal.
Angle of Incidence
It is the angle made by the incident ray with the normal at
the point of incidence.
Angle of Reflection
It is the angle made by the reflected ray with the normal at
the point of incidence.
Regular Reflection
When a beam of parallel light rays falls on a shining but
plane surface, the light rays are reflected back in the same order. It is
regular reflection.
Irregular Reflection
When light beam falls on rough but uneven surface the light
rays reflected back in many directions. This is known as irregular reflection. It
gives scattered or diffused light.
Hence it is the introduction of light if you will find any incorrect
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