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Predict/Calculate $A$ Big Eye The largest eye ever to existon Earth belonged to an extinct species of ichthyosaur, Temnodontosaurus platyodon. This creature had an eye that was 26.4 $\mathrm{cm}$ indiameter. It is estimated that this ichthyosaur also had a relativelylarge pupil, giving it an effective aperture setting of about $f / 1.1 .$(a) Assuming its pupil was one-third the diameter of the eye,what was the approximate focal length of the ichthyosaur's eye?(b) When the ichthyosaur narrowed its pupil in bright light, didits $f$ -number increase or decrease? Explain.

a) 9.7 $\mathrm{cm}$b) increase

Physics 103

Chapter 27

Optical lnstruments

Wave Optics

Rutgers, The State University of New Jersey

University of Michigan - Ann Arbor

University of Sheffield

Lectures

02:51

In physics, wave optics is…

10:02

Interference is a phenomen…

03:21

Predict/Calculate The foca…

04:01

Pupil Size When the bright…

06:07

Predict/Calculate With una…

03:03

BIO The Largest Eye The co…

02:56

Predict/Calculate A studen…

03:51

Pupil size When the bright…

05:32

Predict/Calculate You have…

05:36

$\bullet$ (a) A small …

02:01

The focal length of the hu…

00:53

Okay, sir. In this problem, we have, ah, diameter of the eye of the dinosaur that wa ce that's put in here d equals 26.4. Same team enters. Okay, so let's see what the problem say. We know that this a feature diameter off D gives us f number F number off 1.1. Okay, so what? I was problem. Once we have to consider that's the pupil off the dinosaur was 1/3 diameter off the eye. So we can say that you're featured a amateur that we going to use. That's write this down your teacher diameter that we're going to use this gonna be one dirt off 26 point for. Which gives us our teacher diameter off 8.8 same team managers. Okay, so what else we have to calculate now the focal length off these dinosaur knowing this And remember, the focal length is just the f number. Multiply by their teacher diameter. Therefore, we have the focal lens equals 1.1 times eight point eight. That gives us nine point seven. Same team enters, and that's the answer to a div focal lens in the item B. The F number is, we must know that the F number is inversely proportional to the beach or diameter. Therefore, if the F number increases, the pitcher diameter decreases. So the F number the second item, the F number well increase if the pupil is narrow. So that's the final answer. Thanks for watching.

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