Question

find the angular separation of 5048 Åand 5016Å and wavelength of second order spectrum obtained by a plane diffraction grating having 15000 lines per inch
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Answer 1

Answer:

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Answer 2

Answer:

21.4°

Explanation:

Use the grating formula and solve for 0 for both n = 1 and n =2 , with distances in meters :

nλ = d sin θ

or 0.3225 = sin θ1

and e1 = 18.8° first order

Next, for n =2,

or 0.3225 = sin θ1

and θ1 = 40.2° second order

Finally 02 -01 = 40.2° - 18.8° = 21.4° separation.