Diffraction

The resolving power of a grating is given by:
where:
- is the average wavelength of sodium doublet: Å.
- Å.
- (first-order spectrum).

The resolving power of a grating is given by:
where:
- is the total number of slits,
- is the order of diffraction.

The grating equation is given by:
where:
- (second-order maximum)
- Å = m
-
The grating element is:
Since the number of lines per cm is: