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!

Optics - How long can I see an objects reflection

  1. Nov 5, 2009 #1
    Optics -- How long can I see an objects reflection

    1. The problem statement, all variables and given/known data
    The object is traveling at a constant velocity of 4 m/s. Initially, the observer can not see the object. At a certain point, the observer can see the reflection of the object in the mirror. For how many seconds is the observer able to see the reflection of the object on the mirror?

    http://img32.imageshack.us/img32/8514/mirrorquestion.jpg [Broken]

    2. Relevant equations

    Don't know.



    3. The attempt at a solution

    I know that you have to see if the observer's image on the other side of the mirror can see the object to determine if it's visible to the observer. That's all I know, really. Does it have something to do with similar triangles?
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Nov 5, 2009 #2

    mgb_phys

    User Avatar
    Science Advisor
    Homework Helper

    Re: Optics -- How long can I see an objects reflection

    Light reflects from a mirror at the same angle (to the normal) that it arrives.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook