Question:দৃশ্যমান বর্ণালীর তরঙ্গ দৈর্ঘ্যর বিস্তৃতি- 

A 4000A-10,000A 
B 3000A-8000A 
C 6000A-10,000A 
D 4000A-8000A 

+ Answer
D 

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Md Kamrul Islam

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