What is the use of fluorescent penetrants?
(a) Develop permanent visual records of a remote object
(b) Illuminates and observes internal, closed or inaccessible areas
(c) Enhance the observation of surface cracks
(d) Evaluate surface finish, shape and microstructure
This question was posed to me in class test.
This key question is from Visual Inspection topic in portion Machine Vision Systems of Engineering Metrology