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basic principles of the carrier confinement and the optical confinement in the active region of a double heterojunction (DH) laser.

Can you please provide me the pdf format of Engineering Mathematics by Pal & Das? (for 1st Sem)

Give me the notes on free body diagram??????

Where answer papers of wbut in house students (btech,wbut main University) are checked ,in wbut in house or they are sent to other affiliated colleges???

What are the composition of internal marks? How is the slot test marks add up?