refraction, the bending of rays or waves of light, heat, sound, or the like when passed obliquely from one medium to another with a different rate of transmission., reflection, heat, light, or an image that bounces off an object or surface., iris, the colored circle around the pupil of the eye.he colored circle around the pupil of the eye., lens, a clear part of the eye that brings together the rays of light needed for sight. The lens focuses rays of light so that they form an image inside the eye on the retina., optic nerve, either one of the two nerves that connect the retinas of the eyes to the brain., periscope, a tool that is made up of a long tube with mirrors and prisms that allow one to see things, retina, the part of the eye at the back of the inside of the eyeball. The retina has cells that sense light and color. Images are formed on the retina and sent to the brain., pupil, the small, dark opening in the center of the eye. Light passes through the pupil into the eye.

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