Pieces of glass that focus light rays. - Lenses, Instrument for magnifying small objects. - Microscope, Device for observing distant celestial objects. - Telescope, Material that allows light to pass through. - Transparent, Substance through which light travels. - Medium, Bending of light as it passes between media. - Refraction, Perpendicular line to the surface at incidence point. - Normal, Mass per unit volume of a substance. - Density, Angle at which light strikes a surface. - Incidence, Curved optical element that refracts light. - Lens, Point where light rays converge after refraction. - Focal point, Type of lens that spreads light rays apart. - Diverging,

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