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IP BIO A Big Eye The largest eye ever to exist on Earth
Chapter 27, Problem 93GP(choose chapter or problem)
Problem 93GP
IP BIO A Big Eye The largest eye ever to exist on Earth belonged to an extinct species of ichthyosaur, Temnodontosaurus platyodon. This creature had an eye that was 26.4 cm in diameter. It is estimated that this ichthyosaur also had a relatively large 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, did its f-number increase or decrease? Explain.
Questions & Answers
QUESTION:
Problem 93GP
IP BIO A Big Eye The largest eye ever to exist on Earth belonged to an extinct species of ichthyosaur, Temnodontosaurus platyodon. This creature had an eye that was 26.4 cm in diameter. It is estimated that this ichthyosaur also had a relatively large 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, did its f-number increase or decrease? Explain.
ANSWER:
Solution 93GP
Step 1 of 3
(a)
Here we need to find the focal length of the ichthyosaur’s eye by assuming the pupil diameter equal to the diameter of the eye.
The eye diameter if given to be and the effective aperture setting is about
.
In order o calculate the focal length first we need to determine the aperture diameter and the aperture diameter is given to be,
Using ,