Phase difference/ path difference

    • Thread Starter

    So I'm doing homework on superposition and polarisation and there's a question on phase difference/ path difference that i have no idea how to answer. These are the questions:

    b) path differences give rise to phase differences. By how much do the following change the phase difference?
    (i) 1 wavelength
    (ii) wavelength/2
    (iii) 3 wavelength/4

    c) What path differences would give the following phase differences?

    (i) 90 degrees
    (ii) 120 degrees
    (iii)540 degrees

    Any help would be great!!

    it's a linear relationship

    Dφ(in degrees)=360(Dl/λ)

    so... if difference in path (Dl) = 0λ
    then difference in phase (Dφ) = 0 degrees

    if difference in path = 100λ
    then difference in phase = 36000 degrees

Write a reply… Reply
Submit reply


Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. Oops, you need to agree to our Ts&Cs to register
  2. Slide to join now Processing…

Updated: September 27, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

Would you prefer to be told about sex by your:
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.