Chapter 7, Problem 7.12QAP

Interpretation Introduction

Interpretation:

A grating is given with the wavelength 400nm, angle of incidence 45° and the angle of reflection 7°. Number of lines per millimeter for grating for first order diffraction is to be determined.

Concept introduction:

Calculation of spacing between reflecting surface is done by the following formula

$m\lambda =d(\sin i+\sin r)$

And the number of lines is calculated by-

$\text{no}\text{. of lines}=\frac{1}{d}$