Friday, July 8, 2011

Visible Light - Casandra and Niloy

Visible light are the only electromagnetic spectrum that is visible to the human eye. Visible light are infrared waves, visible waves and ultraviolet waves. Visible waves have wavelengths from approximately 390 to 750 nm. Infrared waves have wavelengths more than approximately 750nm. Ultra Violet waves have wavelengths less than approximately 390nm.  

 Visible Light:  We see these waves as the colors of the rainbow. Each color has a different wavelength. Red has the longest wavelength and violet has the shortest wavelength. When all the waves are seen together, they make white light. When white light shines through a prism, the white 6 light is broken apart into the colors of the visible light spectrum. Water vapor in the atmosphere can also break apart wavelengths creating a rainbow.

We are able to see objects because it is illuminated by visible light. Whenever we see the sky blue, the grass green or an apple red, it is due to us seeing different wavelengths within the 390 to 750 nm band. Through visible light, reflections and refractions are easily observed.

Spectral Colours

Here is a video about visible light

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