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Title:

Light

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Light Light Is a form of energy Behave as an electromagnetic wave Have both electrical and magnetic properties Can travel through empty space Are ... – PowerPoint PPT presentation

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Title: Light


1
  • Light

2
Light
Light
  • Is a form of energy
  • Behave as an electromagnetic wave
  • Have both electrical and magnetic properties
  • Can travel through empty space
  • Are made up of tiny particles or energy called
    photons
  • Unless disturbed, photons travels in straight
    lines.

3
Electromagnetic Spectrum
  • Range of waves or small parts of light waves that
    make a electromagnetic spectrum( Large band of
    waves)
  • Energy of a wave is related to its wavelength
    and its frequency.

4
Visible Light Waves
5
The longer wavelength, lower frequency regions
The shorter wavelength, higher frequency
regions
6
The Electromagnetic Spectrum
7
Electromagnetic waves
  • Visible light waves are the only electromagnetic
    waves we can see
  • Each color has a different wavelength
  • Red has the longest wavelength
  • violet has the shortest wavelength.
  • When all the waves are seen together, they make
    white light.

8
Creating a rainbow.
9
What are electromagnetic waves ?
  • Radio waves
  • microwaves,
  • Infrared
  • Ultra Violet
  • x-rays
  • TV
  • radio transmissions
  • Gama rays

10
Radio Communication contd.
  • Television
  • Sound by FM picture components by AM
  • Telephones
  • Microphone converts sound waves into an
    electrical signal
  • In cell phones, current creates radio waves
    transmitted to and from a microwave tower
  • Cordless and cell phones are transceivers that
    transmit one radio signal and receive another
    from a base unit
  • Global Positioning System (GPS)
  • Uses multiple satellites, monitoring stations,
    and receivers to determine location

11
Electromagnetic Spectrum contd.
  • Radio waves
  • Longest wavelength, lowest frequency, sound
    radar magnetic resonance imaging (MRI)
  • Microwaves
  • Communication, microwaves interfere with the
    water molecules in food causing more friction
  • Infrared
  • Transmits thermal energy
  • Visible Light
  • Frequencies detected by the nerves in the eyes
    blueshortest wavelength redlongest wavelength

12
  • X-rays
  • Can travel through matter and produce images
  • Dense parts of the body absorb more than the soft
    parts of the body
  • Medical diagnosis
  • Gamma rays
  • Highest frequency, lowest wavelength
  • Medical treatments to kill diseased cells, but
    also damages healthy cells

13
Light waves
  • a ray of light passes from one medium to another,
    it bends
  • Depending of the new medium the light will travel
    faster or slower.
  • the medium in which the light travels slower
  • ( in this case the first one) is called the
    denser medium.

14
Rarer medium and Denser medium
  • When a ray of light enters a denser medium, it is
    bent towards the normal.
  • When a ray of light enters a rarer medium, it is
    bent away from the normal.

15
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16

Light Waves
  • When a ray of light strikes a plane mirror, the
    light ray reflects off the mirror.
  • Reflection involves a change in direction of the
    light ray

17
Incident, Reflection and Normal
  • incident ray -the ray of light approaching the
    mirror
  • reflected ray -The ray of light which leaves the
    mirror
  • normal line -At the point of incidence where the
    ray strikes the mirror, a line can be drawn
    perpendicular to the surface of the mirror

18
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19
The angle of incidence
  • is the angle between this normal and the
    incident ray

20
The angle of reflection
  • is the angle between this normal and the
    reflected ray.

21
The Laws of reflection
  • - The angle of incidence is equal to the angle of
    reflection   
  • - The incident ray, the normal, and the reflected
    ray are coplanar(lying or acting in the same
    plane )

22
Three types of materials that affect light
differently.
  • Opaque- Block the light
  • Translucent-May allow some light to pass Ex
    Stained glass.
  • Transparent-allow the light to pass
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