An object that does not allow light to pass through; the light is either reflected or absorbed by the object (ex: wood) - opaque, The bouncing of light, heat, or sound off a surface (ex: mirror) - reflection, The bending of light as it passes at an angle from one type of matter into another (ex: prism) - refraction, Lens rounded like the exterior of a circle; focuses light to form an image - convex, Lens where a surface curves inwards; spreads out light rays - concave, A substance or material in which something goes through (ex: water is a medium that light travels through) - medium, the taking in or soaking in of energy or liquid - absorption ,

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