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questions_area [2018/09/10 14:04] schatz |
questions_area [2018/09/10 19:38] berg |
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* How do we define the central ray? | * How do we define the central ray? | ||
* R11, R12, R21, R22 - can more than one be zero? | * R11, R12, R21, R22 - can more than one be zero? | ||
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