We cannot imagine our life without light. From the first ray of Sun in the morning to the lamp in the night, light accompany us in all the activities. In modern life, three most important sources of light, which I think make major impact on life are the Sun, the light emitting diode (LED) and the laser. We always come across these sources in one way or the other.
Solar Panels in Colorado, US. Credits: Dennis Schroeder/NREL/Light Beyond the Bulb (http://lightexhibit.org/bio_image77.html)
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