Which one of the following statements is incorrect about laser? - Study24x7
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Which one of the following statements is incorrect about laser?

A

It is a technique for producing intense beams of light, ultraviolet or infrared radiation of different wavelength.

B

Even in diamond laser beam can drill a hole.

C

A variety of lasers have been made from solids like the ruby crystal and semi conducting materials, liquids and gases.

D

All waves in laser, travel in phase.

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