Hello, For spherical lenses, how do we calculate Irregularity (P-V) and Power (P-V) as number of rings/fringes?
For example, how is λ/4 P-V surface = 0.5 fringe?
Thank you
Hello Elsa,
I think this is due to definition of “Double Pass Fringes” instead of “Single Pass Fringes”.
https://telescope-optics.net/testing_optical_quality.htm
Kind regards,
Christian
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