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: Is rainbow figure correct ?

  1. Aug 14, 2011 #1
    Is rainbow figure correct ??

    1. The problem statement, all variables and given/known data

    It's a basic principle that why we see rainbow. I've described information in my attachment.
    That figure is given by my teacher, he says to find out mistake in it.

    My attempts

    I think angles on horizontal lines are incorrect, will anyone explain how I tell it to my teacher ???
     

    Attached Files:

  2. jcsd
  3. Aug 14, 2011 #2

    PeterO

    User Avatar
    Homework Helper

    Re: Is rainbow figure correct ??

    One thing - if you look up a picture of a rainbow - especially a double rainbow - you will notice that the order of colours is reversed in one compared to the other.

    That feature is NOT shown in the diagram you included.
     
  4. Aug 14, 2011 #3

    ehild

    User Avatar
    Homework Helper

    Re: Is rainbow figure correct ??

    Try to trace the light rays - both the blue and the red ones- inside the water drop. You will see then what is wrong with your teacher's drawing.

    ehild
     
  5. Aug 14, 2011 #4
    Re: Is rainbow figure correct ??

    What about angles ?? are they correct ??
     
  6. Aug 14, 2011 #5

    DaveC426913

    User Avatar
    Gold Member

    Re: Is rainbow figure correct ??

    Yes it is.
     
  7. Aug 14, 2011 #6

    ehild

    User Avatar
    Homework Helper

    Last edited: Aug 15, 2011
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook