Lasers measured with CD measured with lasers!?!

Can a CD be used as a diffraction grating for lasers to measure the track spacing on the CD and the wavelength of lasers? Time to find out...

Video with diffraction grating:    • MISLABELED LASER | Power and wavelength?  
Video with magnetic motor oil:    • Magnetic Motor Oil? | Easy DIY ferrof...  
All my videos: https://www.youtube.com/brainiac75/vi...

FULL MUSIC CREDIT
Time codes: 0:00 + 0:35
Impact Lento - Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/b...
ISRC: USUAN1100619

Time codes: 1:54 + 5:07 + 6:30 + 11:04 until end
Dream Culture - Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/b...
ISRC: USUAN1300046

Time code: 6:24
The Truth Is Over There - Triunescores
Royalty free. Available from triunestore.com/collections/music-pack

Timecode: 7:39
Perspectives - Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/b...
ISRC: USUAN1300027