Light - Form of energy, Refraction - Bending of light as it passes from one medium to another, Lens - A specifically shaped piece of material like glass or plastic that bends the light travelling through it, Convex lens - Causes light rays to converge, Concave lens - Cause light rays to diverge or spread apart, Retina - Layer of sensory nerves at back of eye, Optic nerve - Carries messages to the brain from the retina, Concave - Type of lens that produces a large magnified image, Convex - Type of lens that produces a small, focussed image, Lenses - Transparent objects bound by two optical planes, Mirror - An object that does not let light pass through, Shadow - The absence of light, Spectacles - Items that help the eye to focus images, Microscope - Instrument that magnifies objects using lenses,

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