Physics Notes for Competitive Exams
OPTICS
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
Self Luminous
Non Luminous
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
Materials
Transparent Material
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.
Opaque
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
Electromagnetic waves
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.
h=Plank Quanta
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.
Electromagnetic waves
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
3 Refraction
4 Reflection
5 Total internal reflection
6 Dispersion of the light
7 Scattering of Light
8 Interference
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
Refection
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
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