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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…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
…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
Luminous vs non-luminous objects
A luminousobject is one that produces light
A non-luminousobject is one that reflects light
Light allows us to visually observe the world around us by illuminating dark spaces
Producing light by IncandescencevsLuminescence
Light given off by an object as a result of the heat produced in a chemical reaction
Light given off by an object that has not been heated. Observed as fluorescence, electrical discharge or chemiluminescence
Examples of light-producing technologies from luminescence
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”
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.
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.