Entoptic Halos Images produced by structures within the eye (like lens fibers or

Question

Entoptic Halos Images produced by structures within the eye (like lens fibers or cell fragments) are referred to as entoptic images. These images can sometimes take the form of "halos" around a bright light seen against a dark background. The halo in such a case is actually the bright outer rings of a circular diffraction pattern, with the central bright spot not visible because it overlaps the direct image of the light.

Find the diameter of the eye structure that causes a circular diffraction pattern with the first dark ring at an angle of 3.7 degrees when viewed with monochromatic light of wavelength 600 nm. (Typical eye structures of this type have diameters on the order of 10 m. Also, the index of refraction of the vitreous humor is 1.336.)

D= ____ m

Explanation / Answer

Correct answer is 8.5 ?m

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