diffraction gratings: Using the principles of interferences to examine light

Diffraction gratings are used in interference experiments and allow for the separation of light into its constituent wavelengths. This is incredibly useful to analyse light that is being emitted by bodies.
In this video I demonstrate their use, provide the mathematical basis and discuss some applications

Watch and find out
ERRATA: at 8:22 I state 300 line per mm is 3 million lines per meter when in fact its 300,000 lines per meters. the final 'd' value is correct.

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[yadiyasin]

Omg this man needs to get more famous🤩👌

[donegal]

Hi Paul d at 9 minutes is 3.3 x 10^-7. Great video as usual, thanks again.

[whitb]

Excellent video. Was struggling to understand the difference between diffraction/interference and diffraction grating/double slit.

[drpindoria]

Very useful observations - thanks for sharing.

[Hambxne]

brilliant video as usual, i always appreciate your content

[mrx]

Brilliant ! Thanks !
Could you please add the uncertainties our yout 'y' and 'd' measurements ? And calculate the propagated uncertainty on the wavelength ? Cheers

[texasfossilguy]

is the 0.14% error due to mfg defects in the grating? temp?

[SciHeartJourney]

I wish to learn how they manufacture diffraction gratings?

[qigong]

So what about non-visible light? How do we calculate infrared wavelengths if we can’t see them? I’m most interested in measuring infrared, thanks.

[irisp]

"slot antenna" magnetfielt Hz? How get DIY radio wave spectrum?

[qigong]

So if I want to measure just blue wavelength from white light source, can I still measure from m=0 (where it is all white) to m=1(first blue line)? Or do I have to measure from blue to blue? Thanks.

[ARCSTREAMS]

im getting confused with the concept, , when monochromatic beam of light goes through these slits or pin hole is it creating interference fringes due to diffraction and waves colliding with each other? and is the same thing happening with a beam of white light? what is the minimum size that you need for a single slit or pin hole for this to happen? also what happens when light or laser goes through a prism is this dispersion by refraction but there is no interference there?

[kelvinkersey]

'I will explain that but first....' and that's when you switch off

[sahilsharma]

Why don't physics teachers use hand held lasers mounted on tripod, compared to large box ones

[essmallgeemuhammadtwahirzu]

Your explanations are great but your data not. there it is supposed to be 3.33 * 10^-7 . numbers are important for application.