# The angular resolution of the human eye

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You are looking down at the earth from inside a jetliner flying at an altitude of 9300 m. The pupil of your eye has a diameter of 2.00 mm. Determine how far apart two cars must be on the ground if you are to have any hope of distinguishing between them with the following lighting. red light (wavelength = 665 nm in vacuum)and violet light (wavelength = 405 nm in vacuum).

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#### Solution Preview

The angular resolution of the human eye is given by,

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<br>dt = lambda/D where lambda is the wavelength and D is the diameter of the pupil.

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<br>for lambda ...

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