   Chapter 27, Problem 38PE

Chapter
Section
Textbook Problem

A He—Ne laser beam is reflected from the surface of a CD onto a wall. The brightest spot is the reflected beam at an angle equal to the angle of incidence. However, fringes are also observed. If the wall is 1.50 m from the CD, and the first fringe is 0.600 m from the central maximum, what is the spacing of grooves on the CD?

To determine

What is the spacing of grooves on the CD if a He−Ne laser beam is reflected from the surface of a CD onto a wall? The brightest spot is the reflected beam at an angle equal to the angle of incidence. However, fringes are also observed. If the wall is 1.50 m from the CD, and the first fringe is 0.600 m from the central maximum.

Explanation

Given info:

m=1

Formula used:

There is constructive interference for a diffraction grating when,

dsinθ=mλ,   m=0,1,1,2,2....

Calculation:

Wavelength of He Ne laser = 633 nm

We also have,

tanθ=0

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