Unit 14 Lesson 4 - WordPress.com€¦ · 14/01/2019 · Unit 14 Lesson 4 What Are Some Properties...
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Unit 14 Lesson 4 What Are Some Properties of Light?
Just Passing Through
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• Light behaves in different ways depending on the kind of matter it meets.
• The amount of light absorbed depends on the material the object is made of.
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Unit 14 Lesson 4 What Are Some Properties of Light?
Just Passing Through
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• Opaque materials do not let light pass through them. Instead, an opaque material absorbs light, which enters the material but doesn’t leave it.
• When a material absorbs light, the energy from the light is transferred to the material.
• Many solid objects, such as metal, wood, and stone, are opaque because they do not allow light to pass through.
• Opaque objects also cause shadows because the objects absorb or reflect all the light that hits them.
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Unit 14 Lesson 4 What Are Some Properties of Light?
Just Passing Through
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• Materials that let light pass through them are transparent.
• Transparent materials absorb very little of the light that hits them.
• This makes it easier to see objects through these materials.
• Clear glass, air, and pure liquid water are transparent.
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Unit 14 Lesson 4 What Are Some Properties of Light?
Just Passing Through
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• Translucent materials transmit some light and absorb some light.
• Ice, wax paper, and frosted glass are translucent.
• You can see through translucent material, but the image is fuzzy or unclear.
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Unit 14 Lesson 4 What Are Some Properties of Light?
Just Passing Through
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Unit 14 Lesson 4 What Are Some Properties of Light?
Mirror, Mirror
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• The bouncing of light off an object is known as reflection.
• Light from an object that strikes a smooth, shiny surface, like a mirror, hits the surface from one direction and reflects in a single new direction.
• You can’t see an image in a rough surface, such as cloth or wood, because roughness causes light to reflect in many directions.
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Unit 14 Lesson 4 What Are Some Properties of Light?
Mirror, Mirror
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• As light strikes the surface of an object, the object absorbs certain colors of light and reflects others.
• For example, grass reflects green light while absorbing all other colors.
• Black objects absorb all colors of light. They also absorb more of the energy in light.
• White objects reflect all colors of light and absorb less energy.
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Unit 14 Lesson 4 What Are Some Properties of Light?
Mirror, Mirror
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Unit 14 Lesson 4 What Are Some Properties of Light?
Mirror, Mirror
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Unit 14 Lesson 4 What Are Some Properties of Light?
Light Bends
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• The bending of light as it passes at an angle from one type of matter into another is called refraction.
• Refraction occurs because the speed of light varies depending on the material through which the light travels.
• As light changes speed and enters a new material, the light bends.
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Unit 14 Lesson 4 What Are Some Properties of Light?
Light Bends
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• A prism is a transparent material that separates white light into its component colors by refraction.
• When white light enters a prism, the different colors of light bend at different angles. Light moves through the prism and exits as a rainbow.
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Unit 14 Lesson 4 What Are Some Properties of Light?
Light Bends
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Unit 14 Lesson 4 What Are Some Properties of Light?
Light Bends
Copyright © Houghton Mifflin Harcourt Publishing Company
• Diffraction is the bending of light around barriers or through openings.
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Unit 14 Lesson 4 What Are Some Properties of Light?
Light Bends
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Unit 14 Lesson 4 What Are Some Properties of Light?
Lenses
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• Lenses are curved transparent objects that refract light.
• Most lenses are circular and are made of clear glass or plastic.
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Unit 14 Lesson 4 What Are Some Properties of Light?
Lenses
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• A convex lens is a lens that is thicker at the center and thinner at the edges.
• Convex lenses are sometimes called positive lenses because they bring light waves together, or focus light.
• This bending allows an image to form at a point called the focal point.
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Unit 14 Lesson 4 What Are Some Properties of Light?
Lenses
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• A concave lens is a lens that is thicker at the edges and thinner at the center.
• Sometimes called negative lenses, concave lenses spread light waves apart from a focal point.
• Eyeglasses may have concave or convex lenses, depending on the type of vision correction needed.
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Unit 14 Lesson 4 What Are Some Properties of Light?
Lenses
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• Many devices use a series of lenses to make images clear. Lenses can vary greatly in size.
• Microscopes use several tiny lenses to magnify small objects.
• Telescopes use lenses that can be over a meter in diameter to magnify objects.
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Lenses
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Unit 14 Lesson 4 What Are Some Properties of Light?
Lenses
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Unit 14 Lesson 4 What Are Some Properties of Light?
Copyright © Houghton Mifflin Harcourt Publishing Company
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Unit 14 Lesson 4 What Are Some Properties of Light?
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