Images produced by structures with the eye (like lens fibers orcell fragments) are referred to as entoptic images. These imagescan sometimes take the form of "halos" around a bright light seenagainst a dark background. The halo in such a case is actually thebright outer rings of a circular diffraction pattern, like thefigure below, with the central bright spot not visible because itoverlaps the direct image of the light. Find the diameter of theeye structure that causes a circular diffraction pattern with thefirst dark ring at an angle of 3.7° when viewed with monochromatic light ofwavelength 655 nm. (Typical eyestructures of this type have diameters on the order of 10 µm.Also, the index of refraction of the vitreous humor is 1.336.)

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