Q. best method for examining the surface finish. Visual, touch and scratch inspection methods are not as accurate as microscopic. In these methods, minute flaws can’t be detected.
✅ Correct Answer: (C)
0.01 mm
Explanation: touch inspection method can tell which surface is rougher. in this method, the finger-tip is moved along the surface at a speed of about 25/sec and the irregularities of about 0.01 mm can be easily detected.