Physics Notes for Competitive Exams
Light is a form of energy emitted by set of luminous body and travels along the straight line.The Sensation of vision is stimulated through optic nerve
Hence light is also called as optics and study of vision is called Ophthalmology and eye specialists known as Ophthalmologist
Depending on the emission of the light from the bodies they are classified into 2 types
The body which depends on Self Luminous body in the universe is called as Non-Luminous body.
ex:-Planets,moons,satellites,wooden plank,human body etc
This material allows transmission of Light through them.
Ex : glass of solid, water, Liquid.
Semi Transparent Material
These material allow the transmission of light partially and remaining is obstructed.
Ex : Paper applied with oil, Tracing papers.
These materials never allow the transmission of light through them.
Ex:-planets, satellites, wooden plank, human body etc.
Theories of Light
Several scientist studied various properties of light and proposed different theories to explain them.
Newtons corpuscular theory
Huygens wave theory
Quantum theory of radiation
Newton’s corpuscular theory
According to Newton the light propagates in the form of minute particles namely corpuscular.
These particles move with high speed through denser medium(glass, water etc) and lies with high speed through rarer medium.
Size of the corpuscular forms the color of the light.
Huygens wave theory
According to this theory, light propagates in the form of mechanical waves through the universal medium namely Ether.
The speed of the light is more in rarer medium and less in denser medium.
The color of the light depends on the wave length of the light hence different wave lengths forms different colors of the light.
Quantum theory of radiations
It was proposed by Max Plank in 1900 AD. According to quantum theory, light propagates in small energy pockets which are known as quanta or photons.
The Quantity of energy in the photon is E = hv.
V=frequency of radiation
But the speed of the speed of Light(c) = ∨λ
v = c ⁄ λ
E = hc ⁄ λ
The quantity of energy of the photon increases either on increasing the frequency or decreasing the wavelength.
Raman’s effect is based on the quantum theory of radiation of the light.
It was proposed by Maxwell. According to him, light propagates in the form of electric and magnetic components
The speed of the light either in air or vacuum
c = 3×10⁸ ms⁻¹
Properties of Light
Properties of light are given as
1 Rectilinear propagation of light
2 Speed of light
5 Total internal reflection
6 Dispersion of the light
7 Scattering of Light
9 Diffraction of the light
10 Polarization of light
Rectilinear propagation of light
The light emitted by self luminous body propagates along the straight line. this is called Rectilinear propagation.
Umbra is region where complete darkness is prevailed and penumbra is a diminished light
The solar and lunar eclipses are formed due to the rectilinear propagation of light
Speed of light
The speed of the light , first determined by Galileo and other(Romer, Broadly, Comer, Piezeo etc)
Foucault, he is the person to determine the speed of the light
c= 3×10⁸ ms⁻¹
Refraction of light
The Bending of the light ray when it propagates from one medium to another is called as reflection of the light.
1. The magnitude of refraction of light rays depends the angle of Beams of light rays
2. The nature of the material medium i.e., Rarer to denser
The sensitization of vision is due to Reflection of the light
All types of mirror will works on the property of the light
The magnitude of the reflection of light depends on the degree of smoothness and roughness of the surface of the body
Total internal reflection
Total internal reflection is the Property of the light by which it under goes the complete reflection inside in object/system
In order to obtain this property the beam of light ray should pass from denser medium to rare medium
1. The glittering of diamond is due to Total internal reflection of light
2. Formation of mirages in the hot deserts and surfaces of BT roads is due to Total internal reflection of light
Dispersion of light
When a beam of white light ray passes through a glass prim than it splits into the 7 consequent colors namely VIBGYOR
This phenomenon is called as Dispersion of light
Scattering of Light
When a beam of light ray collides with a minute particles then it moves in the another direction with the same speed after the impact of the collision .
This property of light is called scattering of the light.
Interference of light
It was 1st observed by Thomas Young
When two or more than light rays super impose on each other than the wave length intensity of the resultant light may changes.
This phenomenon is called interface of light
Diffraction of the light
The bending of light ray around the smaller obstacle is called diffraction
Its was observed by Grimaldie
Polarization of light
Resolving a light ray into the electric and magnetic components is called as polarization
This is Observed by H. Bortholinus
Physics objective questions for competitive exams
For Physics MCQ Questions and Answer – Click Here
Link 1 – Latest Central government Jobs 2019
Link 2 – 1000+ MCQ Bits
Link 3 – Complete Gk Gs for Competitive Exams
Link 5 – Top Books for Competitive Exams
physics notes for competitive exams, Light of physics gk, lightwave gk, physic light gk , the physics of light gk , light waves physics gk, physics project on light gk for exams, light physics notes for exams, physics gk on light, lighting science gk for exams, properties of light notes for exams, physics of light and optics in exams, quantum theory of light gk, physics notes for competitive exams pdf, physics lite gk, light of physics gk, types of lights gk, about light in exams, light energy gk for exams, physics notes for competitive exams pdf, introduction to light in physics syllabus for exams gk,history of light in competitive exams, what is light energy questions in exams, physics light chapter download, physics topic light gk gs questions, what is light, new form of light in physics, the nature of light in physics,the nature of light,light definition in physics for exams, describe light energy, nature of light physics, physics behind light, what is light energy definition, different properties of light in physics in exams,physics notes for competitive exams , what are the theories of light in physics, state the different theories about the nature of light, light energy definition in physics, physics light energy,what is the real nature of light in physics in exams, physics objective questions for competitive exams, physics objective questions for competitive exams, physics notes for competitive exams