An important kind of light and beam(one word which ends with "er")
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A convergent beam of light: Light rays comes together (converges) after reflection and refraction at a single point known as the focus.
Divergent beam of light : Light rays from a point source of light travel in all directions, moving away with time.
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laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term "laser" originated as an acronym for "light amplification by stimulated emission of radiation".[1][2][3] The first laser was built in 1960 by Theodore H. Maiman at Hughes Research Laboratories, based on theoretical work by Charles Hard Townes and Arthur Leonard Schawlow.
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