1. Not finding help here? Sign up for a free 30min 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!

Index of when refraction/optics question

  1. Jun 23, 2016 #1
    The question
    A microscope is focused on a black dot. When a 1.20 cm -thick piece of plastic is placed over the dot, the microscope objective has to be raised 0.380 cm to bring the dot back into focus.

    What is the index of refraction of the plastic

    Relevant equations/ideas
    n1*sin(theta1)=n2*sin(theta2)

    Trying to solve
    I know I must use triangles to figure out the angles needed for Snells law, but have more unknown variables than equations to relate them so I dont know how to solve for them
     
    Last edited: Jun 23, 2016
  2. jcsd
  3. Jun 23, 2016 #2

    Merlin3189

    User Avatar
    Gold Member

    Have you come across real and apparent depth? For example, when you look into a pool of water, it appears shallower than it really is, due to refraction.

    Also, you could pick an arbitrary angle and do the calculation for that. Edit: And I'd always start with a diagram (or several.)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Index of when refraction/optics question
Loading...