What is the minimum number of lines per cm in a 2.5 cm wide grating sp – McqOptions

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1.	What is the minimum number of lines per cm in a 2.5 cm wide grating spectrum which will just resolve two sodium lines (5890 and 5896 ) in the first order spectrum?
A.	98
B.	196
C.	392
D.	694
Answer» D. 694

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