it is the formula of refraction. this is based of snell's law and its about the incident ray and the refracted ray. page 3 of this should be of help to you
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If you choose to include 0 as a whole number (debatable it is only theoretical and not existent) then 99 (01, 02, 03...) but if you include 00 then it is 100. If you wish to include negative numbers as these also are only two digits then it is 199 (assuming you included 00, if not then 198). But even after all of that and you didn't include 01, 02... and -01, -02... then it would be 180. And finally, 0 is another answer because 0000036.00000000000000 is still a whole number but has an infinite number of zeros on the end and in front of the '36'. There is a complex answer to a simple question, enjoy!
Say you had 750+-15. You would do 15 divided by 750 equals .02. Then multiply be 100 to turn it into a percentage and you get 2%.
.02
yes
1 and 0. 12 = 1 02 = 0