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Old Aug 9th 2010, 08:16 PM   #1
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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
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Old Aug 9th 2010, 09:35 PM   #2
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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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