Why is a grating preferred over a single slit for diffraction patterns?

[mkbh_10]

Homework Statement

Why a grating is prefferes over a single slit for obtaining diffraction pattern ?

Homework Equations

The Attempt at a Solution

 

[Mike Cookson]

While a single slit will create a diffraction pattern having multiple ones from the same source will make it more visible, the coherent light waves with interfere to give you a pattern of light and dark regions if projected onto a white surface. At least that would be my thinking.

 

[Meir Achuz]

A single slit gives a broad pattern for each wavelength.
A grating give narrow lines.