A) 2100 nm
B) 4200 nm
C) 8400 nm
D) None of these
Correct Answer: C
Solution :
Shift \[=\frac{\beta }{\lambda }(\mu -1)\,t\] \[\Rightarrow 7\beta =\frac{\beta }{\lambda }(\mu -1)\,t\Rightarrow t=\frac{7\lambda }{(\mu -1)}\]\[=\frac{7\times 600}{(1.5-1)}=8400\,nm.\]
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