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1.

 দৃশ্যমান আলাের তরঙ্গ দৈর্ঘ্য—। 

 

 

  • A. 200 - 380 nm
  • B. 200 - 380 nm
  • C. 200 - 380 nm
  • D. 200 - 380 nm

Answer: Option B

Explanation:

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