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Light
Characteristics, velocity, frequency,
wavelength, The Electromagnetic
Spectrum, Colors
Light
Significance of Light
 Responsible for photosynthesis
 Indirectly responsible for production of
Oxygen
tesCarbohydraOCOOH  222
Sunlight
• Heats up ocean, air, and land which initiates
different weather patterns
• Partly responsible for ocean currents
• Partly responsible for evaporation and
condensation of rain.
Light is a Wave
Light is a wave because it displays some
properties of mechanical waves.
 It reflects. (Reflection)
 It diffracts. (Diffraction)
 It refracts. (Refraction.
Light as Electromagnetic Wave
• Light can propagate without the existence of
physical medium (solid, liquid, gas)
• Light has velocity, wave length, and frequency.
• Light is made up of “Many Light Waves”.
Invisible Light
Invisible Light
Gamma Rays
X-Rays
Ultraviolet rays
Infrared rays
Microwaves
Radio waves
High Frequency,
short wave length
Low Frequency, Long
wavelength
Electromagnetic Spectrum
Each light wave in the electromagnetic spectrum
carries different Frequency and Wave Length,
but their VELOCIY is the SAME.
300000km/slight)ofv(speed
frequencyf
lengthwave
velocity







v
fv
Color
Visible Light (light with colors) – represent a
band of light waves whose wavelength is
between 380 nm – 739 nm.
Monochromatic light – a light wave of one
wavelength
Colors – The light ray which is reflected.
White Light is the combination of all visible light.
White – is not a color.
Black – is also not a color. (No visible light is
reflected.
Different organisms are sensitive to different wave
lengths.
Snakes, and crocodiles – can see the red to infrared
color
Humans, and primates are sensitive to green
colors
Bats – sensitive to infrared light
Human Eye
Retina – inside surface of the pupil. Collections
of cells which are responsible for light
detection.
Rods – Sensitive to the intensity of light
Cones – Sensitive to the wavelengths of visible
light.
Cone Sensitivity Curve
Why are primates (humans, monkeys, apes)
sensitive to green?
Colors – the color we see is the reflected light of
ROYGBIV
Properties of Objects in Relation to Light
Transparent – light passes straight through the
object
Translucent – some light passes through, some
are reflected, some are refracted (scattered
into many directions)
Opaque – no light passes through the object.

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Light

  • 1. Light Characteristics, velocity, frequency, wavelength, The Electromagnetic Spectrum, Colors
  • 2. Light Significance of Light  Responsible for photosynthesis  Indirectly responsible for production of Oxygen tesCarbohydraOCOOH  222 Sunlight
  • 3. • Heats up ocean, air, and land which initiates different weather patterns • Partly responsible for ocean currents • Partly responsible for evaporation and condensation of rain.
  • 4. Light is a Wave Light is a wave because it displays some properties of mechanical waves.  It reflects. (Reflection)  It diffracts. (Diffraction)  It refracts. (Refraction.
  • 5. Light as Electromagnetic Wave • Light can propagate without the existence of physical medium (solid, liquid, gas) • Light has velocity, wave length, and frequency. • Light is made up of “Many Light Waves”. Invisible Light Invisible Light Gamma Rays X-Rays Ultraviolet rays Infrared rays Microwaves Radio waves High Frequency, short wave length Low Frequency, Long wavelength
  • 7. Each light wave in the electromagnetic spectrum carries different Frequency and Wave Length, but their VELOCIY is the SAME. 300000km/slight)ofv(speed frequencyf lengthwave velocity        v fv
  • 8. Color Visible Light (light with colors) – represent a band of light waves whose wavelength is between 380 nm – 739 nm. Monochromatic light – a light wave of one wavelength Colors – The light ray which is reflected.
  • 9. White Light is the combination of all visible light. White – is not a color. Black – is also not a color. (No visible light is reflected. Different organisms are sensitive to different wave lengths. Snakes, and crocodiles – can see the red to infrared color
  • 10. Humans, and primates are sensitive to green colors Bats – sensitive to infrared light
  • 11. Human Eye Retina – inside surface of the pupil. Collections of cells which are responsible for light detection. Rods – Sensitive to the intensity of light Cones – Sensitive to the wavelengths of visible light.
  • 12. Cone Sensitivity Curve Why are primates (humans, monkeys, apes) sensitive to green?
  • 13. Colors – the color we see is the reflected light of ROYGBIV
  • 14. Properties of Objects in Relation to Light Transparent – light passes straight through the object Translucent – some light passes through, some are reflected, some are refracted (scattered into many directions) Opaque – no light passes through the object.