Question:দৃশ্যমান আলোর তরঙ্গ দৈর্ঘ্য এর রেঞ্জ কত? 

A 100 - 300 nm 
B 300 - 360 nm 
C 380 - 700 nm 
D 640 - 850 nm 

+ Answer
C 

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Md. Shariful Islam

Editor, VCampus

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