Physics Help Forum Glass Sphere with Scratch
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 Aug 9th 2010, 08:16 PM #1 Junior Member   Join Date: Nov 2009 Posts: 3 Glass Sphere with Scratch Hi was hoping to get some help with this problem I cant picture the actual problem. A glass sphere 5 cm in diameter has a small scratch on its surface. When the scratch is viewed from a position directly opposite where does the scratch appear and what is its magnification? Assume n= 3/2 for glass. Im not sure whether this means So=0 for the distance through air? I really cant picture this problem any help would be much appreciated
 Aug 9th 2010, 09:35 PM #2 Senior Member   Join Date: Dec 2008 Location: Udupi, Karnataka, India Posts: 289 You have to assume that the scratch is inside the glass. So n/do + 1/di = (n-1)/R where do is the object distance, di is the image distance and r is the radius of curvature. Find di and then the magnification.

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