Entoptic halos. If someone looks at a bright outdoor lamp in otherwise dark surr

Question

Entoptic halos. If someone looks at a bright outdoor lamp in otherwise dark surroundings, the lamp appears to be surrounded by bright and dark rings (hence halos) that are actually a circular diffraction pattern as in the figure, with the central maximum overlapping the direct light from the lamp. The diffraction is produced by structures within the cornea or lens of the eye (hence entoptic). If the lamp is monochromatic at wavelength 691 nm and the first dark ring subtends angular diameter 3.0 degree in the observer's view, what is the near) diameter of the structure producing the diffraction? Number _______ Units

Explanation / Answer

d sin(theta) = m * lambda

d is linear diameter of object

mabda is wavelength

d = 1*691*10^-9/Sin3

d = 1.32*106-5 m

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