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!

Convex mirror question

  1. Jul 25, 2016 #1
    1. The problem statement, all variables and given/known data

    A convex spherical mirror with a focal length of magnitude 25 cm has a 4.0-cm tall flower placed 100 cm in front of it. What is the height of the image of the flower?

    a.20 cm
    b. 1.6 cm
    c .0.80 cm
    d. 4.0 cm
    e. 8.0 cm



    2. Relevant equations

    1/f=1/do+1/di

    M=-di/do=hi/ho

    3. The attempt at a solution

    Using mirror equation I calculated di=33.3cm
    Using Magnification equation I calculated hi=1.33cm

    I thought this would be a simple problem, I don't see my mistake. Do any of you? Thanks in advance.
     
  2. jcsd
  3. Jul 25, 2016 #2

    BvU

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Please, show the steps in your calculation...
     
  4. Jul 25, 2016 #3
    you have used the correct equations, but you forget about the focal length of convex mirror is virtual, hence you should substitutes f = -25 cm, and you should get di = -20 cm , hence, hi = 0.80 cm
     
  5. Jul 25, 2016 #4

    BvU

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Hello yihloong, :welcome:

    Please note that in PF we don't provide the answers: we help the posters learn and understand by pointing at mistakes and by asking relevant questions. Directly giving an answer often robs the poster from a valuable learning experience
     
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: Convex mirror question
  1. Convex mirrors (Replies: 3)

  2. Convex mirror question (Replies: 2)

  3. Convex mirror (Replies: 1)

  4. Convex Mirrors (Replies: 2)

Loading...