Invers bandlikni tushuntirib bering. Spektr necha turga bo’linadi va uni izohlang

1. 
   Invers bandlikni tushuntirib bering.
   
2. 
   Spektr necha turga bo’linadi va uni izohlang.
   
3. 
   Lazerlar to’lqin uzunliklarini keltirib o’ting va izohlang.
   
4. 
   3-satxli energetik sistemani tushuntiring.
   
5. 
   Kogerentlik tushunchasini izohlab bering.