What is Optical Activity? Optical activity, the ability of a substance to rotate the plane of polarization of a beam of light that is passed through it. (In plane-polarized light,…
Year: 2020
Fresnel’s theory
FRESNEL THEORY OF OPTICAL ACTIVITY The phenomenon of rotation of the plane of polarization of light traversing an isotropic optically active medium was first explained by Fresnel, near about 1820,…
Planck’s Law
What is Planck’s Law? Planck’s law describes the spectral density of electromagnetic radiation emitted by a black body in thermal equilibrium at a given temperature T, when there is no…
Concept of Rest Mass of Photon
Concept of Rest Mass of Photon: According to Einstein’s quantum theory light propagates in the form of packets i.e. quanta of energy, which is called photon. The rest mass of…
Length Contraction Notes for Physics
Length Contraction Notes for Engineering Physics: The animations below depict this phenomenon of length contraction. In each animation a spaceship is moving past Earth at a high speed. The spaceship…
The Lorentz Transform Equations for Physics | Explain Lorentz’s Transformation Equations
The Lorentz Transform Equations for Physics: After the review of Galilean transform equations lets look new transformation equations relating (x,y,z,t) and (x’,y’,z,t’). The motion is only in the x direction.…
Galilean Transform Equations Notes for Physics
Galilean Transform Equations Notes for Engineering Physics BTech 1st Year: Galilean Transformation Definition, Galilean Transformation Explanation: In An introduction to the mechanics of Galileo and Newton, we saw that converting…
Time Dilation Notes for Engineering Physics
Time Dilation Explained for Engineering Physics: The most important and famous results in Special Relativity are that of time dilation and length contraction. Here we will proceed by deriving time…
Einstein’s Postulates in Physics Notes
Einstein’s Postulates: With two deceptively simple postulates and a careful consideration of how measurements are made, Einstein produced the theory of special relativity. 1. The Principle of Relativity: The laws…
Michelson Morley Experiment Notes
Michelson Morley Experiment Notes: In the 19th century, physicists generally believed that just as water waves must have a medium to move across (water), and audible sound waves require a…