Select your language

Suggested languages for you:
Log In Start studying!
Answers without the blur. Sign up and see all textbooks for free! Illustration

Q. 35

Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 956

Answers without the blur.

Just sign up for free and you're in.


Short Answer

Light from a helium-neon laser is used to illuminate two narrow slits. The interference pattern is observed on a screen behind the slits. Twelve bright fringes are seen, spanning a distance of . What is the spacing (in mm) between the slits?

The Spacing distance between the two slits is.

See the step by step solution

Step by Step Solution

Step1: Helium-neon laser

Helium-neon (He-Ne) lasers are often used for interferometry because they are inexpensive and produce a consistent, visible output. They generally work at a wavelength of , however customized versions with useable outputs at other visible and infrared wavelengths are also available.


The distance between two adjacent fringes is calculated as follows:

is the distance between two subsequent slits, and is the distance between two successive slits.

We have bright fringes in this problem, which means there are spaces between them. If , the distance between successive brilliant fringes is calculated as follows:

When we combine the two equations for , we get

This results in,

We get numerical values and return them.

Most popular questions for Physics Textbooks


Want to see more solutions like these?

Sign up for free to discover our expert answers
Get Started - It’s free

Recommended explanations on Physics Textbooks

94% of StudySmarter users get better grades.

Sign up for free
94% of StudySmarter users get better grades.