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When laser light is focussed on a particular area for a long time, then that particular area alone will be heated.

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in Engineering Physics II by (679k points)
When laser light is focussed on a particular area for a long time, then that particular area alone will be heated.

(a) True

(b) False

The question was asked in an interview.

Query is from Laser topic in chapter Laser of Engineering Physics II

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The correct choice is (a) True

The explanation: Laser beam has very high intensity, directional properties and coherence. When it is focussed on a particular area for a long time, then the area alone will be heated and the other area will remain as such. This is called thermal effect.

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