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dcherian8173
Joined: 10 Jan 2010
Posts: 5
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 Posted: Mon Feb 15, 2010 2:04 pm Post subject: |
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f = (1/2)r (r = radius of curvature)
f = (1/2)70cm = 35cm = focal point
If the object is placed on the focal point (at 35cm) of a convex lens, then no image will be formed. If it is placed at less than the focal point of a convex lens, the image will be virtual, upright; if placed at a distance greater than the focal length, then the image will be real, inverted. I should have known this. Duh. |
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harrington5609
Joined: 10 Apr 2010
Posts: 8
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| Posted: Sun May 16, 2010 2:35 pm Post subject: focal length of a lens |
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| I got the answer right, but isn't the equation f = 1/2r for mirrors and not lenses? I guessed D because my answer of negative virtual upright and enlarged because it was inside the focal length, was not available. |
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jellywing_2058
Joined: 04 May 2009
Posts: 179
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| Posted: Tue Jun 01, 2010 10:11 am Post subject: |
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| The equation f = r/ 2, would be valid for a lens as well. |
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