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Unit 3 Topic 4-5 Definitions- Glossary II Term page Definition accommodation 215 aperture 216 blind spot 217 concave lens 208 convex lens 208 the process of changing the shape of the lens (in the eye) to adjust for different distances from an object being viewed the opening in the diaphragm of a camera; can let more light reach the film by opening wider the point where the optic nerve enters the retina; has no light-sensing cells a lens that is thinner and flatter in the middle than around the edges; causes refracting rays to come together A lens that is thicker in the middle than around the edges; causes refracting rays to come together diaphragm 216 eyepiece lens 221 far point 215 far-sighted focus iris 210 210 216 iris reflex 217 lens 208 near point 215 near-sighted 210 objective lens 221 in a camera or microscope, the lens that works as a magnifying glass to enlarge the image in a telescope or microscope, the lens that works as a magnifying glass to enlarge the image (of the eye) the greatest distance at which an object is in focus unable to see close objects clearly to bring rays of light to a point in the eye, the coloured ring; works like the diaphragm of a camera the natural adjustment in the eye’s pupil size in response to varying light levels a curved piece of transparent material, usually glass or plastic (of the eye) the shortest distance at which an object is in focus unable to see distant objects clearly the convex lens in a refracting telescope or microscope Term objective mirror page 221 optic nerve 217 prisms 223 pupil 216 reflecting telescope refracting telescope 221 retina 210 shutter 216 221 Definition the mirror in a reflecting telescope; also called the primary mirror the nerve that connects the eye to the brain in binoculars, glass blocks serving as plane mirrors; allow binoculars to be made shorter than telescopes the opening in the eye; appears as the dark centre of the eye a telescope having a concave mirror to collect rays of light from a distant object a telescope having a convex lens to collect and focus light from a distant object, and an eyepiece to magnify the image a light-sensitive area at the back of the eye in a camera, a device that opens the aperture to allow light to reach film