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A lens with outer radius of curvature R and index of refraction n rests on a...

A lens with outer radius of curvature R and index of refraction n rests on a flat glass plate, and the combination is illuminated from white light from above. Is there a dark spot or a light spot at the center of the lens?

a dark spot

a light spot

What does it mean if the observed rings are noncircular?

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