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Optics Problem for stamp placed under glass: Index of refraction

If a stamp is placed under 3 mm of glass with an index of refraction of 1.5, how far below the top of the surface of the glass does the image of the stamp appear?

Does the index of refraction come into play somewhere?

Solution Preview

The image of the stamp will be at a depth of 3 mm and not affected by the index of refraction. ...

Solution Summary

In several sentences, the problem is explained.