What is Reflection of Light - Explain Laws of Reflection - JK Study Materials
The process of sanding back of light rays which falls on the surface of an objects is called reflection of light.
JKBOSE - REFLECTION OF LIGHT - LAWS OF REFLECTION
What is Light
Light is defined a type of energy that helps us to see an objects from which it comes or from which it is reflected.
The Sun, Lamp, Candle etc are the objects that emits their own light, the objects are called Luminous Objects.
The objects like table or chair do not emit light themselves but the objects can reflects or scatter the light which falls on them are called Non- Luminous objects. Even moon is also a non- luminous object. We can see the moon easily this is becouse it reflects the light that falls on it.
Light is also defined as the form of energy that couses us the sensation of sight. Light travels in a stringt line. A bundle of light rays is called "beam of light"
 |
| Reflection of Light |
Nature of Light
The is two theory that defines the nature of light, these are:
Wave Theory
According to the wave theory thevlight is made of electromagnetic waves that does't need any type od objects or medium ( viz Solid, Liquid and Gas ) for their propagation. The wave lenght of visible light wave is very small and the speed of light wave is very high i.e 3×10⁸ metres per second.
Particle Theory
According to particle theory the light is made od particles which travels in a stright linesat very high speed. An elementart particle that defines light is the Photon
So light has a doul nature i.e wave nature and particle nature . The modern theory is called Quantum Theory of Light that is combination of both the Wave theory and Particle theory of Light.
.jpg "Laws of Reflection of Light") |
| Laws of Reflection of Light |
Reflection of Light
When the light falls on any surface of body or objects, it may be absorbed, transmitted or reflected. The process of sanding back of light rays which falls on the surface of an objects is called reflection of light. For example, a polished silver mirror reflects back more then 95 percent of an objects.
The surface having polished, shining surface reflect more light then objects having unpolished, dull surfaces.
Silver metal is one of the best reflectors of light. For example a polished block of silver metal reflects almost all the light that falls on it and does not transmit any light through it. But the surface of silver metal is easily scratched and soon become rough.
Laws of Reflection of Light
The laws of reflection of light apply to all kinds of mirrors i.e plane mirror as well as spherical mirror ( concave and convex ). With the help of laws od reflection of light we can find the nature and position of image or objects by the verious types of mirrors.
The are two laws of leflection of light which are as under:
First Laws of Reflection of Light
Accirdings to the first laws of reflection of light the incident ray, the reflected rays and the normal ( at the point of incidence ) all lie in the same plane.
The rays of light that falls on the mirror surface is called Incident rays
The point at which the incident rays falls on the mirror is called the Point of incidence.
The rays of light that is reflected back by the mirror is called Reflected rays.
A line at right angle to the mirror surface at the point of incidence is called the Normal.
Second Laws of Reflection of Light
According to second laws of reflection of light the angle of reflection is always equal to angle of incidence. If the angle of incidence is ' i ' and the angle of reflection is ' r ' then according to second laws od reflection of light
<i = <r
The ratio of sine of the angle of the incidence of the sine of the angle of refraction is a constant for a given pair media i.e
Sin i
——— = Constant
Sin r
According to second law of reflection the lightvray that is incident normally or perpendicularly on a mirror is reflected back along the same path this is becouse of the angle of incident and the angle of reflection for this light rays is zero.
Join the conversation