Lights

Light is a type of electromagnetic radiation.  Human eye can detect or sense only a part of electromagnetic spectrum.

It is defined as portion of the electromagnetic spectrum which can be detected by human eye. It falls under range between 450nm and 750nm wavelength. It travels in straight line and the speed in vacuum is around 3 × 108 m s–1.

What is Light

It has two types of nature namely particle nature and the wave nature. According to the theory of electromagnetic radiation, each wave has electric field and the magnetic field.
According to the particle theory, it is composed of particles and these particles are termed as photons. This basically contains particles group each of which is termed as photon and has some energy associated with which it invariably depends on frequency.
According to wave theory, it basically consists of a wave, and is composed of the magnetic and electric fields perpendicular in nature. Each of the waves has its wavelength associated with the frequency and energy.

Light Definition

It is defined as visible part of electromagnetic spectrum that has wavelength between 450 and 750 nm.

Light Energy Definition

As we know that it shows both particle nature as well as the wave nature. According to the particle nature of the same, it is made up of small particles named as photons.
Energy of this is expressed by the formulae:
E = hf
Since, the speed of this is f=c/lambda
Therefore,
E = hc/lambda
Where,
E = Energy of the wave,
h= Planck’s constant,
lambda = wavelength of the wave
and c= speed of the light

Is this topic wavelength to frequency equation hard for you? Watch out for my coming posts.

Properties of Light

Properties of the same could be studied as speed, reflection, superposition, refraction, transmittance, wavelength etc.
Speed: It travels in the form of straight line with constant speed in the vacuum and this constant speed is 3 × 108 m s–1.
Reflection: According to the law of reflection, the angle of reflected wave is always equal to the angle of incidence.
Superposition: In presence of multiple luminary waves, the resultant electric field is given as vector sum of all electric fields present at that particular point. This is also known as the law of superposition.
Refraction: Bending of light when it passes through a substance or medium is known as refraction. It depends onthe wavelength or frequency.
Energy: Energy of the visible part E = hf