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Did you carefully complete the reading assignment?
In the previous day's reading, we found a relationship for the
distance of an object and the distance of its image for a reflecting
surface. Today we've done the same but for a refracting surface. How
exactly are these different? (Don't answer in purely mathematical language.)
Is it necessary to assume that lenses are thin? (How thin do they need
to be? Is that realistic?)
Was there anything that you didn't understand in the reading
assignment? If so, explain.
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