Dismiss Notice
Check out the new Application Assistant, where you can calculate your LizzyM score, see how you rank compared to other applicants, and see a list of schools where similar students were accepted.

Flat mirror

Discussion in 'MCAT Study Question Q&A' started by m25, 09.29.14.

  1. SDN is made possible through member donations, sponsorships, and our volunteers. Learn about SDN's nonprofit mission.
  1. m25

    m25

    Joined:
    05.28.14
    Messages:
    304
    Status:
    Pre-Medical
    So I know that if a person of height H wants to see his entire body in a flat mirror, the minimum height of the mirror needed is 0.5H.
    So my question is, in order to see his his entire body in the flat mirror, does

    1) his distance from mirror matter?
    2) vertical location of the mirror matter?

    and if so, where should they be?
     
  2. SDN Members don't see this ad. About the ads.
  3. amy_k

    amy_k

    Joined:
    09.24.14
    Messages:
    192
    Status:
    Non-Student
    1) Distance from the mirror actually does not matter

    2) The top of the mirror needs to be approximately the same height as you, specifically at least reaching to half the distance between your eyes and the top of your head

    It is probably easiest to draw a diagram:

    For 1)
    [​IMG]
    If you move back further away from the mirror as shown, it will change the angles of incidence and reflection, but assuming a flat ground your height does not change as you move back, so the bottom of the mirror is still halfway between your eyes and feet, and therefore the length of mirror required to see your feet is the same.

    For 2)
    [​IMG]

    The top of the mirror needs to be a minimum height of halfway between your eyes and the top of your head so that the light from the top of your head could reflect back to your eyes as shown.

    I hope this helps
     
    m25 likes this.
  4. m25

    m25

    Joined:
    05.28.14
    Messages:
    304
    Status:
    Pre-Medical
    Ah, perfect. Thank you!!
     

About the ads

Similar Threads
  1. rrreagan
    Replies:
    1
    Views:
    861
  2. Andrew_Doan
    Replies:
    5
    Views:
    1,737
Loading...

Share This Page