Black objects ____ most of the light that strikes them. White objects reflect more of the light. Shiny objects ____ a lot of light. Opaque objects ____ and reflect light. ____ is the bending of a wave when it passes from one medium to another. ____ is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Light travels in a ____ line. Light can pass straight through ____ materials. ____ substances, like water and glass, ____ light to pass through them. This means objects ____ be seen clearly through a transparent substance. ____ materials ____ some light to pass through them. In ____ materials, not all light passes through and sometimes it ____ direction, therefore images viewed through translucent materials are visible but ____ clearly and are often distorted. ____ materials are substances which light ____ pass through, like stone, metal or wood. The light is ____, scattered or reflected so it does not pass through the material. Luminous objects, like the Sun, can be seen because they ____ their own light. The light travels in a ____ line directly from the source to your eye Non-luminous objects, like the Moon, ____ their own light, but they ____ because they reflect light from ____ objects. The light travels in a straight line directly from the object to your eye. Ray diagrams are used to show the path that light takes. The rays of light are represented using ____ lines, with an arrowhead to show the direction the light is travelling. When light hits a mirror, it ____ from the surface of the mirror Light waves change speed when they pass across the boundary between two substances with a different density, such as air and glass. This causes them to change direction, an effect called ____

unit5 light

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