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Which characteristic of LASER allows it to be used in holography?

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Which characteristic of LASER allows it to be used in holography?

(a) Coherency

(b) Directionality

(c) Intensity

(d) Monochromaticity

This question was posed to me during an online interview.

This question is from Introduction and Applications of Laser in chapter Laser of Engineering Physics II

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The correct option is (a) Coherency

To explain: The production of an image in a hologram takes place via a process called reconstruction. In this process, the image is “reconstructed” in the form of a hologram. This reconstruction if possible, via LASER as they are highly coherent.

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