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Light

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

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  1. Light Chapter 18

  2. 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

  3. 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

  4. Plane Mirror • produces an image that is right side up (virtual) and the same size as the object being reflected Chapter 18

  5. Concave Mirror • Surface curves inward. • Forms either a virtual image or real image (pg. 573) • used for make-up mirrors Chapter 18

  6. Convex Mirror • Surface curves outward. • Forms a virtual image (pg. 574) • used for security or blind spots on roads Chapter 18

  7. 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

  8. Concave lenses • parallel light rays are bent away from the center of the lens (pg. 578) • forms virtual image Chapter 18

  9. 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

  10. 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

  11. Section 4 - Seeing Light • Eye picture pg.588 • cornea - • iris - • pupil - • lens - • retina - • optic nerve - Chapter 18

  12. nearsighted - eyeball too long. corrected with concave lens • farsighted - eyeball too short. Corrected with convex lens Chapter 18

  13. Section 5 - Using Light Chapter 18

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