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When the heat rays from the sun area focused on a piece of
black cloth by means of a lens, the cloth catches fire. Why ?
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It is because the heat radiations obey the laws of refraction.
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i pass my B.Sc. in 1999(chemistry. i dont understand what study after bsc. i am an average student.After my Bsc i joint my brother factory and i work there as a production, QC and electrical testing for Oil. i try to another job but my exprince not match my education co u tale me what i do.
Organic Chemistry 
