Discuss the experiment determine the wavelenght of different colours using diffraction grating.
Determination of wavelenght of diferent colours:

Explanation

When white light is used, th,e diffraction pattern consits of a white cental maximum and on both sides contnuous coloured diffraction patterns are formed. The central maximum is white as all the colours meet here constructively with no path diffraction of different orders for all colurs from violet to red. It produces a spectrum the angle at which these colours appear for various orders of diffraction, the wavelenght of different colours could be calculated using the formula,
`lambda = (sin theta)(Nm)`
Here, N is the number of rulings per metre in the grating and m is the order of the diffraction image.