Answer to Question #164080 in Optics for Banakeng

Question #164080

 A diffraction grating produces a second-order principal maximum at 50.6° to the normal when being illuminated normally with light of wavelength 644nm. Calculate the number of lines per millimeter of the grating and the total number of principal maxima produced.


1
Expert's answer
2021-02-18T18:46:04-0500

Given Parameters are:-

order, n=2

Angle, θ=50.6\theta=50.6^{\circ}

Wavelength, λ=644nm=644×106mm\lambda=644nm=644\times 10^{-6}\text{mm}


As we know,

nλ=dsinθn\lambda=dsin\theta

2×644×109=d×sin50.62\times 644\times 10^{-9}=d\times sin50.6^{\circ}


d=1288×106sin50.6\Rightarrow d=\dfrac{1288\times 10^{-6}}{sin50.6^{\circ}}


=1666.8×106=1.67×103mm1666.8\times 10^{-6}=1.67\times10^{-3}mm


So, The number of lines per mm is 1d=11.67×103=598.8\dfrac{1}{d}=\dfrac{1}{1.67\times 10^{-3}}=598.8


Hence The number of lines per mm is 598.8599598.8\equiv599


As there are second order principal maxima so,


Total of 55 images is seen on screen from which 3 are principal maxima.


Total number of maxima produced=3= 3




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