A) 28
B) 29
C) 65
D) 66
Correct Answer: B
Solution :
The cut-off wavelength when \[\Rightarrow \] is, \[\lambda =\frac{20}{2n+1},\,\,n=0,\,\,1,\,\,2,...\] ?(i) The cut-off wavelength when \[\Rightarrow \] is \[\lambda =20,\,\frac{20}{3},\,\frac{20}{5},\,\frac{20}{7},...\] ?(ii) The wavelength corresponding to \[\phi \] line is. \[\tan \,\phi =\frac{V}{H}\] ?(iii) From given information, \[\theta \] Solving above equation, we get \[H'=H\,\cos \,\theta ,\].with the help of Eqs. (i), (ii) and (iii).You need to login to perform this action.
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