10-25-2017, 02:45 PM
EOU, thank you for your kind words and also for mentioning your interesting optical experiments. I would like to exhort you to continue towards the knife edges. May be the next generation of users will welcome the choice between mechanical and optical sharpness testers.
Just out of curiosity. The picture from Wikipedia shows an interference pattern observed when light is reflected from the top and bottom boundaries of a thin oil film. The reinforced colours show areas of the same thickness of the oil film.
Just out of curiosity. The picture from Wikipedia shows an interference pattern observed when light is reflected from the top and bottom boundaries of a thin oil film. The reinforced colours show areas of the same thickness of the oil film.