Physics, 24.09.2020 16:01 SKYBLUE1015
The maximum resolution of the eye depends on the diameter of the opening of the pupil (a diffraction effect) and the size of the retinal cells. The size of the retinal cells (about 5.0 mm in diameter) limits the size of an object at the near point (25 cm) of the eye to a height of about 50 mm. (To get a reasonable estimate without having to go through complicated calculations, we shall ignore the effect of the fluid in the eye).
A) Given that the diameter of the human pupil is about 2.0 mm, does the Rayleigh criterion allow us to resolve a 50 mm tall object at 25 cm from the eye with light of wavelength 550 nm?
B) According to the Rayleigh criterion, what is the shortest object we could resolve at the 25.0 cm near point with light of wavelength 550 nm?
C) What angle would the object in part B subtend at the eye?
D) Compare the value, found in part C, with the experimental value of about 1.00 min. Which of the following is correct?
1. The found value is very close to the experimental value.
2. The found value essentially differs from the experimental value.
E) Which effect is more important in limiting the resolution of our eyes, diffraction or the size of the retinal cells?
Answers: 2
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