Diffraction (Young's Double Slit & Grating) - A-level & GCSE Physics

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00:00 Intro
00:54 Young's double slit experiment
04:20 Interference, path & phase difference
10:31 Interference patterns: double & single slits
12:15 Diffraction grating -
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god bless you, you just explained grating better than my textbook and my teacher combine, thank YOU

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The first 20 seconds gave me a better explanation of why waves diffract when going through a slit, than my teacher could in 2 lessons.

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For A-Level pupils in my last job, I built a device that demonstrates De Broglie’s theorem. A laser passes through a diffraction grating creating an array. A motor spins the diffraction grating to produce the rings

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The AQA A-level spec also mentions that students should know uses of diffraction gratings - one is xray crystallography, which is used to identify elements. This is also how DNA was discovered (by Watson and Crick, I think)

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[@nathanielbird9552]

We did a practical before learning much theory on diffraction gratings, and I'm pleased to say I understood what we did then, having watched this. The switch from Young's equation to this n x wavelength = slit width x sin theta makes all the more sense, and I understand the reciprocal relationship between 'D' (grating) and 'd' (slit width) now. Other useful pointers received from the video, so thank you very much :)

[@altacademyorg]

If you still need help with A Level Physics, you should check out Alt Academy, we have a TON of resources, including video lessons, revision guides, 24/7 academic support, handwritten past paper solutions with explanations on each step, and we even have our instructors sit live every night and solve a timed past paper, explaining why they're taking each step.

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thanks for the video but how do you produce white light fringes if only monochromatic light emerges from the single slit

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In the interference pattern for a single slit, what do you mean when u say the single slit is double the width of the fringes. And is the central max brighter compared to the double-slit central max?

[@livelygoats]

Thank you, that definitely made a lot more sense! I have a questions though... if you had to find the wavelength and were given d and the angle between the first and second order, what do you put for n? if that makes sense!

[@ScienceShorts]

Theta can only ever be the angle from the 0th order, not an angle between two other orders.

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THANK YOU for explaining D vs d, every other explanation I've seen has completely glossed over how to convert "xxx slits per mm" into the number you put into the equation so that was super helpful!

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really helpful

[@sssssnake222]

Could you use the probability of them going through several slits at a certain probability to amplify, or confine a laser beam?

[@leophoenixmusic]

See, thing is we were never told that the equation used assumes a curved screen, which is why I find this topic so confusing, as the usually explanation makes no sense on the scale that we draw it at, and if you try measuring the actual lengths in the diagrams, the maths won’t work out. However on the scale of actual wavelengths of light and slit separation, we can make assumptions and approximations as it makes much less of a difference.

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