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The dragon Smaug has an eye that is 25 cm long from lens to retina. Assuming its eye works like a human one, what power

The dragon Smaug has an eye that is 25 cm long from lens to retina. Assuming its eye works like a human one, what power would its lens system (i.e., cornea plus crystalline lens) have to be in order for it to have good focus?

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