Asked by pritam | 2nd Apr, 2010, 03:00: PM
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 | 2nd Apr, 2010, 03:26: PM
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