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Please Help Mirrors/lenses

  1. Apr 6, 2009 #1
    Please Help!! Mirrors/lenses

    I have been working on a Physics assignment for a long time now, and I can't seem to figure out three questions. It's due tonight, so any help would be greatly appreciated!!

    Here they are:

    1. A dentist uses a small mirror of radius 36 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 13 mm from the tooth, what is the magnification of the image?

    2. The sun falls on a concave mirror and forms an image 4.3 cm from the mirror. If an object 24 mm high is placed 13.4 cm from the mirror, where will its image be formed?

    (a) Use the lens/mirror equation. Where will the image be formed?
    2wrong check mark cm (from the mirror)
    (b) How high is the image?

    3. Shiny lawn spheres placed on pedestals are convex mirrors. One such sphere has a diameter of 45.0 cm. A 12 cm robin sits in a tree 1.2 m from the sphere. Where is the image of the robin?
    (a)______ cm (from the mirror)
    How long is the image?
    (b)_____ cm
  2. jcsd
  3. Apr 7, 2009 #2


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    Science Advisor
    Homework Helper

    Hi wakefreak90! :wink:

    Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:

    Start with 1 … what formula do you think is appropriate?
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