Epicurus was honing in on the correct idea, but it took until the 9 th and 10 th centuries before we started to get close to what really happens. 300 BCE) that suggested light is emitted by sources other than the eye or the object itself and that vision is produced when light reflects off objects and enters the eye. It was the Greek philosopher, Epicurus ( c. Other Greek philosophers - most notably Euclid and Ptolemy - used ray diagrams quite successfully to show how light bounces off a smooth surface or changes direction as it passes from one transparent medium to another. Epicurus argued the opposite: Objects produce light rays, which then travel to the eye. Pythagoras (about 500 years BCE), best known for the theorem of the right-angled triangle, proposed that vision resulted from light rays emerging from a person’s eye and striking an object. But we didn’t always understand it this way. They are used in several everyday applications and also for specific scientific studies.We can see objects because light reflects off that object and into our eyes. Thus, reflection, refraction and diffraction are three important properties of light, the effects of which are evident in nature. The phenomenon of diffraction is applied in making diffraction gratings, which are used for studying the structure of atoms and the composition of stars in space.
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