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For line D1 and Wavelength 5890 A:
Angles at which first order and second order maxima will be observed are :
Order :1 ,20.355 degrees
Order :2 ,44.081 degrees
For line D2 and Wavelength 5895.9 A :
Angles at which first order and second order maxima will be observed are :
Order : 1, 20.376 degrees
Order : 2, 44.136 degrees
When n = 3, sin(theta)= ((n*lambda*10^-8)/a_plus_b)>1 , which falls outside the sine range, hence third order maximum is not visible
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