1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: When to use destructive or constructive equation for young's DS exp.

  1. Mar 26, 2013 #1
    1. The problem statement, all variables and given/known data
    Light of wavelength 646 nm passes through a slit 5.50 × 10^-6 m wide and falls on a screen that is 2.01 m away. What is the distance on the screen from the center of the central bright fringe to the third dark fringe on either side?

    2. Relevant equations
    destructive: (m+1/2)λ=dsin(θ)
    constructive: (m)λ=dsin(θ)

    3. The attempt at a solution
    You're supposed to use the constructive equation, where m=3. Why don't we use destructive equation? (Since we're interested in the center to dark fringe at m=3)
  2. jcsd
  3. Mar 26, 2013 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

  4. Mar 26, 2013 #3
    Helpful link! thank you :)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted