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Light

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Refraction and Lenses Concave Lenses - In this picture the concave lens forms an image that is smaller, ... Refraction and Lenses Convex Lenses ... – PowerPoint PPT presentation

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Title: Light


1
Light Reflection Mirrors
  • When light hits an object
  • The light can be reflected.
  • The light can be absorbed (opaque).
  • The light can be transmitted (transparent or
    translucent).
  • Kinds of Reflection Regular reflection occurs
    when parallel rays of light hit a smooth surface.

2
Light Reflection Mirrors
  • Diffuse Reflection occurs when parallel rays of
    light hit a bumpy or uneven surface. Most objects
    reflect light diffusely!

3
Light Reflection Mirrors
  • 4. Plane Mirrors Flat mirrors produce an image
    that is right side up and the same size as the
    object being reflected called a virtual image.
  • Virtual Images vs. Real Images
  • Right-Side Up Upside Down
  • or or
  • Upright Inverted

4
Light Reflection Mirrors
  • Concave Mirrors Can form either virtual images
    or real images.

5
Light Reflection Mirrors
  • 7. Convex Mirrors Always form virtual images.

6
Refraction and Lenses
  • Refraction of Light When light rays enter a new
    medium at an angle, the change in speed causes
    the light rays to bend or change direction.
  • Index of Refraction How much a material causes
    a light ray to bend when the light ray enters
    that material.
  • 10. Prisms, Rainbows, Mirages all are
    examples of light being refracted.

7
Refraction and Lenses
  • Concave Lenses - In this picture the concave lens
    forms an image that is smaller, upright and just
    in front of the actual object.

8
Refraction and Lenses
  • Convex Lenses can produce both virtual and real
    images.

9
Color
  • Color The color of an object is the Color of
    the light it reflects.
  • 14.Objects and White Light Objects that appear
    white reflect all the colors of the visible light
    spectrum. Objects that appear black absorb all
    the colors of the visible light spectrum.
  • 15.Primary Colors of White Light Red, Green, and
    Blue can be combined to form secondary colors.
    Red Green Yellow Pg. 584 in Text

10
Color
  • 16. Complementary Colors of White Light Any two
    colors that combine to form white light.
  • Ex. Yellow Blue White
  • 17. Pigments Substances that are used to color
    other materials. The more pigments that are
    combined the darker the mixture looks.

11
The Human Eye
  • 18. Nearsightedness - The eyeball is too long.
  • 19.Farsightedness The eyeball is too short.
  • Both can be corrected by eye glasses or
    contacts.

12
Using light
  • 20. Telescopes use lenses or mirrors to collect
    and focus light.
  • 21. Microscopes use a combination of lenses to
    produce and magnify an image.
  • 22. Cameras use lenses to focus light and
    record an image of an object.

13
Using light
  • 23. Laser Light Amplification Stimulated
    Emission Radiation
  • Laser Beam waves of the same wavelength or
    color and all the waves are in sync or in step
    with each other.
  • 24. Uses of Lasers
  • a. To make compact discs CDs
  • b. Surgery Soft Tissue
  • c. Holograms gt 3 Dimensional photographs by
    using the light from a laser.

14
Using light
  • 25. Optical Fibers Long, thin strands of glass
    or plastic that can carry light for long
    distances without allowing the light to fade out
    .
  • Total Internal Reflection Light keeps going
    even if the optical fiber is curved or curled up
    .

15
Using light
  • 26. Communications Greatly improved by fiber
    optics a. Telephone Service
  • b. Computer Networks
  • c. Cable T.V. Systems
  • 27. Medicine Optical Fibers can be used to
    examine internal organs without major surgery.
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