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1.

দৃশ্যমান আলাের তরঙ্গ দৈর্ঘ্যের পাল্লা—

 

  • A. (3-1) x 10-7m
  • B. (3-1) x 10-7m
  • C. (3-1) x 10-7m
  • D. (3-1) x 10-7m

Answer: Option C

Explanation:

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