Which one of the following statements is incorrect about laser?

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Question:
Which one of the following statements is incorrect about laser?

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

2.Even in diamond laser beam can drill a hole.

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

4.All waves in laser, travel in phase.

Posted Date:-2021-03-06 14:09:03


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