Product of spectra by diffraction gratings

[Arlz]

1. Explain the physical principles of the production of spectra by diffraction gratings. include production of zero, first and second order spectrum.

Homework Equations

The Attempt at a Solution

Diffraction and interference?

 

[Arlz]

please reply soon.

 

[cristo]

You need to show some work, or at least give us a hint that you've thought about the question before we can help you. So what have you thought about? As a starter, what's a spectrum, or a diffraction grating?

 

[Arlz]

ok. A diffraction grating is a piece of glass, metal (or plastic)with many, equidistant, closely spaced lines ruled on them by a diamond point.
>The lines scatter light while spaces between them transmit light and act as slits.
>Diffraction occurs at the slits which behave as sources of secondary wavelets, that superimpose beyond the slits.
> constructive interference occurs with wavelets at different directions corresponding to bright bands i.e the spectra of light.
>a spectrum is a series of adjacent images of the filament formed by the constituents colours of white light.
these are the basics i know.
>i know the angle at which the components of light emerges from the grating correspond to a particular order.
so can u please help me with the rest and jus make everything clear in my head for me?

 

[Arlz]

waves is the only topic in physics that just doesn't click in my head. i need to understand this to get a scholarship! :(