engineering recuitment MPPKVVCL Line Attendant Mock Test 2025 Electrician and Wireman Measuring Instruments
What is the purpose of providing a mirror behind the pointer in a measuring instrument?
1
The scale is illuminated through the mirror
2
To observe that the pointer is bend or not
3
Being semi-transparent, a mirror helps in the study of inner construction of the instrument
4
To make the reading free from an error by removing parallax between the pointer and its image.