lecture 30

lecture 30 - Problem 1 Doublecrested cormorants are...

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Problem 1 – Double crested cormorants are extraordinary birds. They can focus on objects in the air, just like we can, but they can also focus underwater, when they dive in to snatch upatas tyf ish . Todoth is, they have one of the largest accommodation ranges in nature – that is, they can change the focal length of their eyes by an amount greater than any other animal. When the cormorant plunges into the ocean to catch a fish, it can change the refractive power of its eyes by 45 diopters (compared to just 16 iopters umans) ) ould is ange 5 iopters e crease r
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– Without his glasses, Isaac can see objects clearly only if they are less than 4.5 m away from his eyes. When he puts on his glasses, which sit a distance of 2.1 cm from his eyes, he can see distant objects clearly. Is Isaac nearsighted or farsighted? What is the focal length of his glasses?
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This note was uploaded on 08/04/2009 for the course PHYS 2002 taught by Professor Blackmon during the Spring '08 term at LSU.

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lecture 30 - Problem 1 Doublecrested cormorants are...

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