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What is the use of a laser beam in image formation?

(a) Triangulation system for measuring system

(b) Reduce glare of image

(c) Controls contrast of image

(d) Controls brightness of image

This question was posed to me in an international level competition.

This interesting question is from Principle of Working topic in portion Machine Vision Systems of Engineering Metrology

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Correct answer is (a) Triangulation system for measuring system

Explanation: Laser beam is used for triangulation system for measuring distance. Polarised or ultraviolet light is used to reduce glare or increase contrast. It is important that light source is placed correctly since it influences the contrast of the image.

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