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The pupil opening of a human eye is about 2 mm. If the average wavelength of visible light is taken as 5000 Å, the eye’s approximate angular resolving limit is

1. 2 minutes
2. 1 minute
3. 0.5 minute
4. 1.5 minutes

Correct answer: 1 minute

Solution

The angular resolving limit of the eye can be calculated using the formula that relates the wavelength of light to the size of the aperture. Given the pupil size and the wavelength of visible light, the calculation shows that the eye can resolve details down to approximately 1 minute of arc.

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