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Asked by pritam 2nd April 2010, 3:00 PM
Answered by Expert

Aperture is a tiny hole, and not a diameter of reflecting surface. For example, take a sheet of paper and pierse with a needle, you got an aperture in the sheet of paper.

Yes, the derivations are important, practise them they'll help you.




Answered by Expert 2nd April 2010, 3:26 PM
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