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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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Presentation Transcript
light

Light

Chapter 18

reflection and mirrors
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

slide3
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

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

Chapter 18

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

Chapter 18

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

Chapter 18

refraction and lenses
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

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

Chapter 18

convex lens
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

color
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

section 4 seeing light
Section 4 - Seeing Light
  • Eye picture pg.588
    • cornea -
    • iris -
    • pupil -
    • lens -
    • retina -
    • optic nerve -

Chapter 18

slide12
nearsighted - eyeball too long. corrected with concave lens
  • farsighted - eyeball too short. Corrected with convex lens

Chapter 18