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Assuming human pupil to have a radius of 0.25 cm and a comfortable viewing distance of 25 cm, the minimum separation between two objects that human eye can resolve at 500 nm wavelength is:

1. 100 μm
2. 300 μm
3. 1 μm
4. 30 μm

Correct answer: 30 μm

Solution

The minimum resolvable separation between two objects by the human eye can be calculated using the Rayleigh criterion, which takes into account the wavelength of light and the size of the pupil. Given the parameters, the calculation shows that the minimum separation is indeed 30 μm, making it the correct answer.

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