Teacher's low-tech laptop hack to display handwritten notes for online class

Re:Teacher's low-tech laptop hack to display handwritten not... by bentpins on Sunday September 13, 2020 @07:50PM (#24464952)

Didn't mean to come across as a troll, this is how I remember CDs, with rainbow diffraction. https://www.google.com/search?tbm=isch&q=cd

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Re:Teacher's low-tech laptop hack to display handwritten not... by simias on Sunday September 13, 2020 @08:55PM (#24465481)

I think at such shallow angles it's the plastic surface that becomes reflective, not the metal layer with the pits and grooves. Hence the lack of diffraction (and hence why it works with my black PSX disc).

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Re:Teacher's low-tech laptop hack to display handwritten not... by kevin_thibedeau on Sunday September 13, 2020 @10:33PM (#24466187)

She's using a CD-RW with blue/purple dye. The reflection is definitely coming off the surface.

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