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Where is backlighting is best suited?

(a) Simple silhouette image is required to obtain minimum image contrast

(b) Certain key features on the surface of the object are to be inspected

(c) Simple silhouette image is required to obtain maximum image contrast

(d) Three-dimensional feature is being inspected

I got this question by my school principal while I was bunking the class.

The question is from Principle of Working in chapter Machine Vision Systems of Engineering Metrology

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Right choice is (c) Simple silhouette image is required to obtain maximum image contrast

Easy explanation: Backlighting is suited when a simple silhouette image is required to obtain maximum image contrast. When certain key features on the surface of the object are to be inspected, front lighting is used.

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