Quick Optics Question on Gratings (Small calculation)

[_Mayday_]

Hey,

Well, just a quick question, if a grating had 3,000 slits per mm, what would the distance between groves be? Is it 1mm/3,000 which would give me the grove distance?

 

[_Mayday_]

So 1/3000 = 3.33x10^-4 is the distance between gooves?

 

[Doc Al]

Is it 1mm/3,000 which would give me the grove distance?

Sounds right to me.

So 1/3000 = 3.33x10^-4 is the distance between gooves?

In mm.

 

[_Mayday_]

^ When using using the formula $$n \lambda = d \sin(\theta)$$ trying to find the wavelength would I use it in mm?

I've basically conducted an experiment, using a sodium lamp and spectrometer, and want to see how accurate it is by comparing my results with an online result, but am having trouble finding a source that tells me the wavelengths, that I can compare to with my results.

 

[Doc Al]

^ When using using the formula $$n \lambda = d \sin(\theta)$$ trying to find the wavelength would I use it in mm?

When using that formula, the wavelength will have whatever units "d" has. You can always convert it to more convenient units, such as nm.

This might help: http://hyperphysics.phy-astr.gsu.edu/Hbase/quantum/sodium.html#c2"

 

[_Mayday_]

I swear I saw a blue line as well though? For the orange line i got 5.7x10^-5 mm, i don't know hwo accurate that is.