engineering recuitment HPCL Engineer Mock Test 2024 Production Engineering (Manufacturing) Metrology and Inspection
Optical square is
1
Engineer’s square having stock and blade set at 90°
2
A constant deviation prism having the angle of deviation between the incident ray and reflected ray, equal to 90°
3
A constant deviation prism having the angle of deviation between the incident ray and reflected ray, equal to 45°
4
Used to produce interference fringes