1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Image formed by concave mirror; completed need someone to check

  1. Mar 1, 2010 #1
    1. The problem statement, all variables and given/known data

    A person accidentally bit his tongue and wants to examine the bite by using a concave mirror. The mirror is placed 10 cm from the bite with the result that a virtual image of the bite appears 4 times actual size. Find the parameters s (distance from object to mirror), s' (distance from mirror to image), and R (radius of convex mirror).

    2. Relevant equations
    1/s + 1/s' = 1/f ; f=focal length
    Magnification = -s'/s
    f = R/2

    3. The attempt at a solution

    i got s = 10 cm
    then using magnification formula (4 = -s'/s)
    i got s' = -40 cm (negative b/c its a virtual image)
    i then got focal length = 13.3333 using formula 1
    so if f=R/2; R = 26.6667 cm

    any input would be appreciated
     
  2. jcsd
  3. Mar 1, 2010 #2
    Hi hodgepodge

    I think you got it right
     
  4. Mar 1, 2010 #3

    rl.bhat

    User Avatar
    Homework Helper

    Your solution is correct.
     
  5. Mar 2, 2010 #4
    thanks
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook