(a)
Interpretation:
An echelle grating has a focal length of 0.85 m, diffraction angle of 61°16’ and groove density of 120 groves/mm. Reciprocal linear dispersion for diffraction order 30 of an echelle grating needs to be determined.
Concept introduction:
Theoretical reciprocal linear dispersion can be calculated by the following formula-
Here,
D-1= reciprocal linear dispersion
d= groove width of echelle grating
n= no. of order
f= focal length
β= angle of diffraction
(b)
Interpretation:
Reciprocal linear dispersion for diffraction order 90 for same echelle grating is to be determined.
Concept introduction:
Theoretical reciprocal linear dispersion can be calculated by the following formula-
Here,
D-1= reciprocal linear dispersion
d= groove width of echelle grating
n= no. of order
f= focal length
β= angle of diffraction
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Chapter 10 Solutions
Principles of Instrumental Analysis
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