)a) You are holding a small object as close as you can to your eye. What is the
ID: 1412496 • Letter: #
Question
)a) You are holding a small object as close as you can to your eye. What is the limit on how small an object you can see due to the size of your photoreceptors? A cone in your eye is about 10µm across. The closest you can hold an object to your eye an focus on it is about 15cm. The distance between the lens in your eye and the retina is about 2cm. (8) h h1 Figure 1. Imaging in your eye. b) An apple “retina” display must have, according to Steve Jobs, at least 300 pixels/inch. How does this compare to the smallest thing you can see? (2)
Explanation / Answer
the limit on how small an object you can see = 3.14 * 10 * 10-6 * 10 * 10-6/0.15
= 2.093 * 10-9 m
=> this compare to the smallest thing you can see = 1.575 * 10-9 m
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