CBSE CLASS 10 PHYSICS :-
LIGHT Reflection & Rarefraction
Introduction to Light
Light is an Invisible radiation which produces a sensation of sight actually light is composed of three components that is Infrared ultraviolet and visible part. Visible part is also composed of seven colours and which are known as VIBGYOR. It means violet, Indigo, blue, green, yellow, orange, red.Light has many properties like reflection, refraction, interference and so on.Let’s study about reflection of light and its uses.What is reflection of light ? When light falls on an object it rebounce in the same direction or by making some angle with the incident light or ray depending on the nature of the surfaces is called reflection of light. Here we see when light falls on smooth surfaces then the reflection of light is known as regular reflection or smooth reflection while reflection from rough surface is known as irregular or diffused reflection.According to the laws of reflections angle of incidence is equal to angle of reflection. And incident, ray reflected ray and normal meet at a point on the reflecting surface.
Can we see any object without reflection of light?
No we cannot see any object without reflection of light that is why we are not able to see any object in the dark because there is no reflection, no sensation created in our eyes, no information of any object is sent to our mind for interpretation but as soon as the light will fall on the object we will be able to see the object soon because of the reflection of the light.
We are not able to see the blackhole because of no reflection of light.
There are numerous uses of reflection of light based on reflection, refraction, interference.In Solar cooker light reflects from its plane mirror to make the food. And in Solar furnaces light reflects from concave mirrors to raise the temperature of furnace more than 100 degree C some metal, non- metals, glitters due to the reflection of light Diamonds especially glitters due to the internal reflection of the light from its faces and in daily life we see the some more examples like reflection of car headlight from its reflector. In photography light is allowed to fall on object for getting clear image and so on