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LIGHT
NATURE OF LIGHT
Sir Isaac Newton believed that light behaves like a
particle.
Corpuscular or Particle Theory
“Light consisted of streams of particles emitted by the
light source.”
Christian Huygens believed that light behaves like a
wave.
Wave Theory
“Light is a wave that originates from a vibrating
body.”
NATURE OF LIGHT
Thomas Young showed that light behaves
like a wave.
Max Planck came up with what is now
known as the Dual-Nature of Light.
James Clark Maxwell proposed the
electromagnetic Theory of Light.
Electromagnetic Theory
James Clark Maxwell showed that
electric and magnetic fields were
propagated together and that their
speed was identical with the speed of
light.
Electromagnetic Spectrum
COMMON SOURCES OF LIGHT
Natural Sources
Luminous body – an object capable of
producing its own light.
Ex: Sun
Artificial Sources
Ex. Lamps, bulbs etc..
LIGHT AND MATERIALS
How light behaves when it strikes an
object depends on many factors,
including the material of the object is
made of.
Materials can be:
1. Transparent
2. Translucent
3. Opaque
TYPES OF MATERIAL
1. TRANSPARENT
-Transmits light, which means it allows most
of the light that strikes it to pass through it.
2. TRANSLUCENT
-scatter light.
3. OPAQUE
-either absorbed or reflects all the light that
strikes it.
TYPES OF MATERIAL
INTERACTION OF LIGHT
When light strikes a new medium,
the light can be reflected, absorbed, or
transmitted. When the light is
transmitted, it can be refracted.
Polarized, or scattered.
CHARACTERISTICS OF LIGHT
1. BRIGHTNESS
- depends on the source and distance from
the source.
- Can be expressed as luminous intensity
with a unit known as candela.
Photometer- instrument that can measure the
luminous intensity of light.
Luminous Intensity – refers to the amount of
light power emanating from a point source
within a solid angle of one steradian.
Assignment:
BRING THE FOLLOWING: (BY
GROUP)
- 1/8 Illustration board
- Plastic filters (Green, blue, and red)
- 3 pieces of high intensity flashlights
- Scotch tape

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Light

  • 2. NATURE OF LIGHT Sir Isaac Newton believed that light behaves like a particle. Corpuscular or Particle Theory “Light consisted of streams of particles emitted by the light source.” Christian Huygens believed that light behaves like a wave. Wave Theory “Light is a wave that originates from a vibrating body.”
  • 3. NATURE OF LIGHT Thomas Young showed that light behaves like a wave. Max Planck came up with what is now known as the Dual-Nature of Light. James Clark Maxwell proposed the electromagnetic Theory of Light.
  • 4. Electromagnetic Theory James Clark Maxwell showed that electric and magnetic fields were propagated together and that their speed was identical with the speed of light.
  • 6. COMMON SOURCES OF LIGHT Natural Sources Luminous body – an object capable of producing its own light. Ex: Sun Artificial Sources Ex. Lamps, bulbs etc..
  • 7. LIGHT AND MATERIALS How light behaves when it strikes an object depends on many factors, including the material of the object is made of. Materials can be: 1. Transparent 2. Translucent 3. Opaque
  • 8. TYPES OF MATERIAL 1. TRANSPARENT -Transmits light, which means it allows most of the light that strikes it to pass through it. 2. TRANSLUCENT -scatter light. 3. OPAQUE -either absorbed or reflects all the light that strikes it.
  • 10. INTERACTION OF LIGHT When light strikes a new medium, the light can be reflected, absorbed, or transmitted. When the light is transmitted, it can be refracted. Polarized, or scattered.
  • 11. CHARACTERISTICS OF LIGHT 1. BRIGHTNESS - depends on the source and distance from the source. - Can be expressed as luminous intensity with a unit known as candela. Photometer- instrument that can measure the luminous intensity of light. Luminous Intensity – refers to the amount of light power emanating from a point source within a solid angle of one steradian.
  • 12. Assignment: BRING THE FOLLOWING: (BY GROUP) - 1/8 Illustration board - Plastic filters (Green, blue, and red) - 3 pieces of high intensity flashlights - Scotch tape