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Light. Chapter 18. Reflection and Mirrors. Opaque - a material that reflects or absorbs all of the light Transparent - a material that allows light to pass through Translucent - a material that scatters light as it passes through. light rays represented in straight lines

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Light l.jpg

Light

Chapter 18


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Reflection and Mirrors

  • Opaque - a material that reflects or absorbs all of the light

  • Transparent - a material that allows light to pass through

  • Translucent - a material that scatters light as it passes through

Chapter 18


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  • light rays represented in straight lines

  • regular and diffuse reflection pg.571

  • image - copy of an object formed by reflected or refracted rays

Chapter 18


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Plane Mirror

  • produces an image that is right side up (virtual) and the same size as the object being reflected

Chapter 18


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Concave Mirror

  • Surface curves inward.

  • Forms either a virtual image or real image (pg. 573)

    • used for make-up mirrors

Chapter 18


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Convex Mirror

  • Surface curves outward.

  • Forms a virtual image (pg. 574)

    • used for security or blind spots on roads

Chapter 18


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Refraction and Lenses

  • When light rays enter a new medium at an angle, the change in speed causes them to bend, or change direction

  • index of refraction - a measure of how much a ray of light bends when it enters that material (pg. 576)

  • mirage - an image of a distant object caused by refraction of light

Chapter 18


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Concave lenses

  • parallel light rays are bent away from the center of the lens (pg. 578)

  • forms virtual image

Chapter 18


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Convex lens

  • parallel light rays are bent towards the center of the lens (pg. 578)

  • forms virtual or real image dependent upon position

Chapter 18


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Color

  • The color of an object is the color of the light it reflects

  • primary colors - red, green , blue

  • when combined the primary colors produce white light

  • complementary colors - two colors that combine to create white light

  • pigments - substances that are used to color other materials

Chapter 18


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Section 4 - Seeing Light

  • Eye picture pg.588

    • cornea -

    • iris -

    • pupil -

    • lens -

    • retina -

    • optic nerve -

Chapter 18


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  • nearsighted - eyeball too long. corrected with concave lens

  • farsighted - eyeball too short. Corrected with convex lens

Chapter 18


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Section 5 - Using Light

Chapter 18


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