If the light wave is traveling at an angle to the normal and the speed that light travels is different in the two materials, the wave will be bent, or refracted. Copyright © McGraw-Hill Education The Behavior of Lightġ0 Refraction of Light Refraction is caused by a change in the speed of a wave when it passes from one material to another. To cause a regular reflection, the roughness of the surface must be less than the wavelengths it reflects. Copyright © McGraw-Hill Education The Behavior of LightĪ metal pot might seem smooth, but at high magnification, the surface shows rough spots. Reflection of light from a rough surface is diffuse reflection. Copyright © McGraw-Hill Education The Behavior of LightĪ brick wall has an uneven surface that causes incoming parallel light waves to be reflected in many directions. Reflection of light waves from a smooth surface is regular reflection. Copyright © McGraw-Hill Education The Behavior of LightĪ smooth, even surface like that of a pane of glass produces a sharp image by reflecting parallel light waves in only one direction. Reflection of Light Animation FPO Add link to concepts in motion animation from page 369 here. Copyright © McGraw-Hill Education The Behavior of LightĦ Add link to concepts in motion animation from page 369 here. According to the law of reflection, light is reflected so that the angle of incidence always equals the angle of reflection. Copyright © McGraw-Hill Education The Behavior of Lightĥ The Law of Reflection Because light behaves as a wave, it obeys the law of reflection. Reflection occurs when a light wave strikes an object and bounces off. Copyright © McGraw-Hill Education The Behavior of LightĤ Reflection of Light For you to see your reflection in a mirror, light has to reflect off you, hit the mirror, and reflect off the mirror into your eye. Only a small amount of light is absorbed and reflected. Transparent materials transmit light without scattering it, so you can see objects clearly through them. You cannot see clearly through translucent materials. Materials that transmit light but also scatter are described as translucent (trans LEW sunt). Opaque (oh PAYK) material only absorbs and reflects light-no light passes through it. The type of matter in an object determines the amount of light it absorbs, reflects, and transmits. Objects can absorb light, reflect light, and transmit light-allow light to pass through them. Copyright © McGraw-Hill Education The Behavior of Light For you to see an object, it must reflect some light back to your eyes. 1 12.1 Essential Questions How are transparent, translucent, and opaque materials different? What is the index of refraction of a material? Why does a prism separate white light into different colors? Copyright © McGraw-Hill Education The Behavior of LightĢ Light and Matter What you see depends on the amount of light in the room and the color of the objects.
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