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posted by  kiki18 on 5/27/2008 10:30:13 PM  |  status: Live  

Mirror problems please help!

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Question Details:
Camera lenses are described in terms of their focal length. A 50.0 mm lens has a focal length of 50.0 mm.
(a) A camera with a 50 mm lens is focused on an object 3.2 m away. Locate the image.
mm
(b) A 930 mm lens is focused on an object 125 m away. Locate the image.
mm

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posted by Varmonds on 5/28/2008 5:59:00 AM  |  status: Live
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kiki18's comment:
"Thanks!!"
Response Details:
given
a) focal length of camera lens is f = 50mm
   object distance d0 = 3.2m = 3200mm
 we have   the lens equation as
     1/f = 1/di +1/d0
       or 1/di = 1/f - 1/d0
                 1/di = 1/50mm - 1/3200mm
                  di = 50.79mm
    b) focal length of camera lens is f = 930mm
   object distance  d0 = 125000mm
    we have   the lens equation as
     1/f = 1/di +1/d0
       or 1/di = 1/f - 1/d0
                 1/di = 1/930mm - 1/125000mm
                  di = 936.97mm
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