For this question your laser has a wavelength of 641.1[nm]. You measure a distan

Question

For this question your laser has a wavelength of 641.1[nm]. You measure a distance from diffraction grating to screen to be 310[mm] and the first spot is measured a distance from center axis to be 1.297E+02[mm]. How many slits per millimeter are there? Number of slits / mm ------------------>>>>Answer to the nearest integer slit. I answered as 653, and got it incorrect.

Since I have to Answer to the nearest integer slit, is the answer 652.61??

y = n*lambda*D/d d = 641.1*10^-9 * 310*10^-3 / 1.297*10^-1 = 1.5323130300693909020817270624518e-6 m

lines per m = 652608.16842020519168163589797777 lines per

mm = 652.6081

Explanation / Answer

OBS:

1. in order to get a reliable result, you have to work in IS units, meaning, meters.

I got for n: 652.608*106 tr/m

2. you cannot make the approximation to 653 since you cannot add the difference (in the scratch, on the grating) to obtain another slit... So, you keep the largest integer less than the initial number: 652.

So, the answer should be: n=652*103 tr/mm.

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