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1) o lasers are pointed owards a mi or with an angle o incidence o o ne has a block o transparent material n=15) between it ard the mimor. Both are ur ed on at the same me. 5 nanoseconds elapse between he t me the first beam returns to the original position and the time the second beam does. What is the length of the block in cmy? Answer 100

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to travel equial dicranc (n)c 15 m 1.5 -1 on 5 d- 3m Hl bo 6o 2 tan30 tan 30. H. L-2 tan30 브 2tar3o

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