Light Introduction. Read this article for more background information:

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Mervin Benson
5 years ago
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1 Light Introduction Read this article for more background information: Color Absorption Article Watch the following video on terms like Absorption, Reflection, and Transmission Video 1 Waves 1 Stephanie Elkowitz

$response of a wave when it hits a barrier: Reflection Refraction Diffraction Interference Waves 2 Stephanie$

2 Wave Behavior When a wave encounters a barrier it behaves in a certain way The following properties are the response of a wave when it hits a barrier: Reflection Refraction Diffraction Interference Waves 2 Stephanie Elkowitz

7 REFLECTION Light reflects, or bounces, off the surface of objects. When we look at an object, it is reflected light that we see. A mirror is a smooth and shiny surface that reflects light to produce clear images. A mirror s smooth surface causes light to reflect evenly off it it. This is why mirrors, unlike other surfaces, can produce images. Waves 7 Stephanie Elkowitz

$REFRACTION Light refracts, or bends, when it moves from one medium into another. It bends because its speed changes. When light moves into a new medium, the wavelength of light changes.$

10 REFRACTION Light refracts, or bends, when it moves from one medium into another. It bends because its speed changes. When light moves into a new medium, the wavelength of light changes. This causes the change in speed. Refraction of light explains the picture to the right. Light bends as it enters the water, which it explains why the paintbrush appears to be bent. Waves 10 Stephanie Elkowitz

$REFRACTION A prism cause a unique type of light refraction. A prism is a transparent, triangular object.$

11 REFRACTION A prism cause a unique type of light refraction. A prism is a transparent, triangular object. Because of its shape and material, it causes white light to separate into 7 different colors. We call this dispersion. When white light enters a prism, the different colors refract differently. This causes white light to separate into a spectrum of colors. Waves 11 Stephanie Elkowitz

$DIFFRACTION Light waves will bend or diffract if they encounter a small object or have to pass$ $Example: Diffraction explains the silver lining around clouds.$

14 DIFFRACTION Light waves will bend or diffract if they encounter a small object or have to pass through a small opening in a barrier. When light waves diffract, they produce a banding pattern. Example: Diffraction explains the silver lining around clouds. Light waves have to bend to get around or through a cloud. This produces a banding pattern of light around the cloud. Waves 14 Stephanie Elkowitz

INTERFERENCE Light waves can interfere with each other. When light waves interfere, they superimpose, or lay over each other. This alters the intensity of light.

21 INTERFERENCE Light waves can interfere with each other. When light waves interfere, they superimpose, or lay over each other. This alters the intensity of light. Light waves can constructively interfere to produce brighter light. Light waves can destructively interfere to produce dimmer light. Destructive interference Constructive interference Waves 21 Stephanie Elkowitz

These mediums allow all light to pass through which is

22 TRANSPARENT Matter that allows all light to pass through is transparent. Glass and air are transparent. These mediums allow all light to pass through which is why you can easily through them. Waves 22 Stephanie Elkowitz

23 TRANSLUCENT Matter that allows some light to pass through is translucent. Most light waves are scattered by a translucent object. Paper and plastic are translucent. They allow some light to pass but you can t see clearly through them because they cause most light waves to scatter. Waves 23 Stephanie Elkowitz

24 OPAQUE Matter that does not allow light to pass through is opaque. An opaque object completely blocks light. Wood, metal and stone are opaque. Most living things, including humans, are opaque as well. Waves 24 Stephanie Elkowitz

25 SHADOW An opaque object produces a shadow. A shadow is the region where light is obstructed or blocked. A shadow appears on the opposite side of the light source. Waves 25 Stephanie Elkowitz

26 The acoustics slides may help you begin to tackle the bonus question

SESSION 5: INVESTIGATING LIGHT. Key Concepts. X-planation. Physical Sciences Grade In this session we:

SESSION 5: INVESTIGATING LIGHT Key Concepts In this session we: Explain what light is, where light comes from and why it is important Identify what happens when light strikes the surface of different objects