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Light and Optics. Properties of Light. Light… …travels in straight lines …travels at a speed of 300,000 km/sec (8 trips around the world in 1 second!) …travels faster than sound Thunder and Lightning Pistol fired …from the Sun is converted to heat when it reaches the earth

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properties of light
Properties of Light

Light…

…travels in straight lines

…travels at a speed of 300,000 km/sec (8 trips around the world in 1 second!)

…travels faster than sound

Thunder and Lightning

Pistol fired

…from the Sun is converted to heat when it reaches the earth

Is absorbed, reflected or passes through an object

Vision as a reflection of Light

Shadows

Luminous vs non-luminous objects

luminous vs non luminous
Luminous vs non-luminous

A luminousobject is one that produces light

Examples:

  • Sun
  • Light Bulb
  • Electrical Discharge

A non-luminousobject is one that reflects light

Examples:

  • Moon
  • Tree
  • Clouds
light energy
Light Energy…

Light allows us to visually observe the world around us by illuminating dark spaces

Producing light by IncandescencevsLuminescence

Incandescence

Light given off by an object as a result of the heat produced in a chemical reaction

Luminescence

Light given off by an object that has not been heated. Observed as fluorescence, electrical discharge or chemiluminescence

light and energy
Light and Energy…

Examples of light-producing technologies from luminescence

electromagnetic waves
Electromagnetic Waves

Light is energy and travels like a wave

Energy we call light is related to certain other forms of energy.

You may have heard of microwaves, ultraviolet or UV rays, Xray. Eachof these forms of energy are generally grouped as Electromagnetic waves

The electromagnetic spectrum is the entire range of electromagnetic waves arranged according to their frequencies or wavelengths

Electromagnetic waves all have different properties. But they all travel the same speed – what we call “The speed of light”

electromagnetic spectrum
Electromagnetic Spectrum

The electromagnetic spectrum represents the range of energy from low energy, low frequency radio waves with long wavelengths up to high energy, high frequency gamma waves with small wavelengths.

electromagnetic spectrum1
Electromagnetic Spectrum

Visible light is a small portion of this spectrum. This is the only part of this energy range that our eyes can detect. What we see is a rainbow of colors.