Light Wave Interference Test – 2

1. What is the method to find low and high spots?

2. How much height intervals relative to optical flat is represented by a spacing of fringes?

3. Given figure is a surface to be tested by surface contour test. How much lower or higher is B than Z in this given figure?

4. If any surface has a scratch on it and surface is tested by surface contour test then, what is the depth of scratch? (D= distance between fringes, d= distance due to scratch)

5. Which of the following is not true for optical flats used in surface contour test?

6. What is the nature of the surface if curve bands around the line of contact when the surface is tested under surface contour test?

7. Which of the following option is true for given statements about surface contour test?
Statement 1: In a monochromatic light, bands are lighter near the point of contact.
Statement 2: To study surface contour it is important to know the point of contact with optical flat.

8. Curvature of bands is more. What does this statement indicate when surface is tested under surface contour test?

9. How much change is the elevation of surface corresponds to the single fringe interval in surface contour test?

10. Which is the wavelength of a spectrum which is used in surface contour test?