Hi, I'm doing a experiment/report on this topic, I'm trying to get a better understanding of the equation "nλ = dsinθ"(adsbygoogle = window.adsbygoogle || []).push({});

ALL length measurements are in meters for simplicity's sake.

n = bright spot number from the central bright spot (n0)

d = distance between slits

The angle "θ" and distance between slits "d" are known in this experiment.

I drew a diagram to represent how "I think" it works! basically what would happen when monochromatic light would do as it passes through diffraction grating!

The image is zoomed in very close!

I know that this equation is derived from trigonometry, but I be correct in what I am saying in the diagram?

Another question I have:

Is the "nλ = dsinθ" flawed? what I noticed was, if you look at the results below, the wavelength seems to be inverse proportional to "n"...is this possibly slight errors I did during the experiment? or is it because the further the waves spread the less wave length it will have?

Sorry if this seems silly, I've been trying to crack it for hours...if someone can advise me I would be grateful, but please keep your answer dumbed down as much as possible for me to understand!:P

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# Homework Help: Calculating the wavelength of a laser? (Diffraction grating)

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