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ChemistryPrinciples of Instrumental Analysis(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- D − 1 = d cos β n f Here, D -1 = reciprocal linear dispersion d= groove width of echelle grating n= no. of order f= focal length β= angle of diffractionStart your trial now! First week only $4.99!*arrow_forward*

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7th Edition

Douglas A. Skoog + 2 others

Publisher: Cengage Learning

ISBN: 9781305577213

Chapter 10, Problem 10.4QAP

Interpretation Introduction

**(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

Interpretation Introduction

**(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