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Old Dec 26th 2010, 02:04 AM   #1
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Refraction

why should the length of a normal be at least 6cm while finding the angle of refraction?
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Old Dec 26th 2010, 02:43 AM   #2
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the person who said that to you must have giving you some kind of rule of thumb to make a clear drawing

you dont need to use any specific length, just one that is comfortable to find the angle
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Old Dec 26th 2010, 06:22 PM   #3
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hey!thanks!do you really think so because it's a question my teacher asked..and he told us it was an alternative to practical question..
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