Polishing a BK7 Prism to 4020 Scratch Rating

AI Thread Summary
To polish a BK7 prism to a 40-20 scratch surface rating, using fine wet sandpaper is recommended. It is important to ensure the grit is suitable for achieving the desired finish. Resources like optical technologies and precision services can provide additional guidance. Proper techniques and materials are crucial for achieving a high-quality polish. Following these suggestions will help in successfully polishing the prism.
Desh627
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I have a bk7 prism (borosilicate...) and I'd like to polish it to a 4020 scratch surface rating. How would I go about doing this?
 
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