Results 1 to 2 of 2

Math Help - Physics: Easy questions on light

  1. #1
    Member Mr Rayon's Avatar
    Joined
    Sep 2007
    Posts
    137

    Physics: Easy questions on light

    Assume that your eyes are located at the top of your 1.60 m tall body.
    a) What size plance mirror would you need to see your whole body if you were standing 1 m from it?
    b) How far from the floor should the bottom edge of the mirror be placed?
    c) How would your answers to (a) and (b) change if you assumed your eyes were 10 cm from the top of your head?
    d) How would your answers to (a) and (b) change if you were 2 m from the mirror?

    I'm not sure how to start these problems. However, I suspect that you'd have to know that the angle of incidence equals the angle of reflection since that seems the most relevant thing to what we've done so far. Anyway any explanations, tips or other help will be appreciated!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by Mr Rayon View Post
    Assume that your eyes are located at the top of your 1.60 m tall body.
    a) What size plance mirror would you need to see your whole body if you were standing 1 m from it?
    b) How far from the floor should the bottom edge of the mirror be placed?
    c) How would your answers to (a) and (b) change if you assumed your eyes were 10 cm from the top of your head?
    d) How would your answers to (a) and (b) change if you were 2 m from the mirror?

    I'm not sure how to start these problems. However, I suspect that you'd have to know that the angle of incidence equals the angle of reflection since that seems the most relevant thing to what we've done so far. Anyway any explanations, tips or other help will be appreciated!
    Draw a picture showing the limiting rays from your eyes to the image of your feet (and the top of your head). For you to be able to see your whole body in the mirror these limiting rays must pass through the mirror, and so define the minimum size of mirror to see your whole body.

    CB
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. questions in physics ( last)
    Posted in the Math Topics Forum
    Replies: 3
    Last Post: November 9th 2010, 08:27 PM
  2. Replies: 0
    Last Post: June 23rd 2010, 03:59 PM
  3. Physics easy torque question
    Posted in the Advanced Applied Math Forum
    Replies: 2
    Last Post: December 17th 2008, 04:03 PM
  4. Physics questions
    Posted in the Math Topics Forum
    Replies: 4
    Last Post: November 22nd 2007, 03:10 PM
  5. easy physics question
    Posted in the Advanced Applied Math Forum
    Replies: 2
    Last Post: April 24th 2007, 10:25 AM

Search Tags


/mathhelpforum @mathhelpforum