How does plane diffraction grating forms a spectrum?, Other Engineering

Assignment Help:

Q. With necessary theory explain the formation of spectrum by a plane transmission grating when composite light falls on it

OR

How does plane diffraction grating forms a spectrum? On which factors does the width of a spectral line depends?

When a beam of light of wavelength falls normally on a grating the principle maxima are formed in the direction given by

From equation (1) it is clear, that for a given order n, the angle of diffraction '?' varies with l.  As the wavelength increases, the angle of diffraction also increases.

Hence if white light is incident on grating, then each order will contain principle maxima of different wavelength in different direction. The principle maxima of all wavelength corresponding to will form the first order spectrum and so on.

The principle of maxima of all wavelength corresponding to will however be along the same direction. Hence, the zero order maxima will be white having on either side of it first order spectrum, second order spectrum and so on. Most of light is concentrated in the zero order principle maxima and the intensity goes on gradually decreasing as we move towards higher order spectrum. As we know the secondary maxima are not necessary to be seen.

The factor on which the width of spectral line depends : The angular width is inversely proportional to the total number of lines ruled on the grating and order of principal maxima and directly proportional to ?n. since the increase in ?n is less than the increase in n, therefore the angular width of principle maxima decreases for higher values of n.

 


Related Discussions:- How does plane diffraction grating forms a spectrum?

Mobile Communication, A car, moving in the south-east direction at a veloci...

A car, moving in the south-east direction at a velocity of 5 m/s, receives a ray of power of -120 dBm each from the north, east and west. The carrier frequency is 300 MHz. (i) Sket

Aieee, aieee ka course karne ke liye kya karna padega

aieee ka course karne ke liye kya karna padega

The integrator, Integrator This circuit performs the calculus operation...

Integrator This circuit performs the calculus operation of integration. An operational amplifier with negative feedback applied via a capacitor (instead of a resistor) will pe

Presintering, Presintering is an operation in which the powder metallurgy ...

Presintering is an operation in which the powder metallurgy components after compaction are heated for a short time to a temperature considerably below the final sintering tempera

Bajaj electronics, HOW WOULD YOU JUDGE THE POTENTIAL PROFIT OF BAJAJ ELECTR...

HOW WOULD YOU JUDGE THE POTENTIAL PROFIT OF BAJAJ ELECTRONICS ON THE FIRST YEAR OF SALES TO BOOTH PLASTICS AND GIVE YOUR VIEWS TO INCREASE THE PROFIT?

Engineering seminar, Hey ,How are you? I need help in another class , its 1...

Hey ,How are you? I need help in another class , its 1 credit class ( Engineering seminar ), how to choose s.d in this class , , ,so we want describing our project which is ( radi

What is eft?, What Is EFT? EFT is short for Electronic Funds Transfer in...

What Is EFT? EFT is short for Electronic Funds Transfer in finance. An EFT is a method of transferring money from one bank account directly to another account without any paper

Corrosion cracking, offer an explanation for why cracking might have occurr...

offer an explanation for why cracking might have occurred. Give at least three suggestion on how to prevent this type of corrosion. You may supple with appropriate figures

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd