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Ady1	30/07/2021 12:49:15
6137 forum posts 893 photos	Very pretty
Michael Gilligan	25/08/2021 13:19:39
23121 forum posts 1360 photos	Just resurrecting this thread to mention that the video I linked this morning includes an interesting piece about reflective diffraction gratings; commencing a little after 22minutes duration. MichaelG. . Ref. https://www.model-engineer.co.uk/forums/postings.asp?th=169694&p=1 Edited By Michael Gilligan on 25/08/2021 13:25:02
Robin Graham	27/08/2021 00:43:00
1089 forum posts 345 photos	Thanks Michael, that's an interesting video. I have pursued this a little further by setting up a primitive apparatus involving various clamps, a red laser pointer and a baking-parchment screen. I can see fairly well defined maximums and minimums. They're smeared of course, but I suppose that shows - well something! I'll refine my apparatus and see if I can make any meaningful measurements. Pointless in some ways perhaps, but entertaining. Robin.
Michael Gilligan	27/08/2021 22:56:03
23121 forum posts 1360 photos	This might help, Robin Light Waves - Finding Slits per mm for a Diffraction Grating: LINK https://youtu.be/w57LvV4WZkY MichaelG.
Robin Graham	28/08/2021 02:02:23
1089 forum posts 345 photos	Thanks Michael. The chap who made that video is a very good teacher I think. My problem isn't so much the theory (my PhD project involved a scratch built magneto-optical spectrometer, so I got to know a bit about diffraction gratings) as setting things up to measure angles etc in my ramshackle workshop. A pleasant 7 minute watch though! Regards, Robin

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