WAEC - Physics (1996 - No. 1)
The diagram above represents a portion of a micrometer screw gauge in which the horizontal scale is in millimetres. What is the reading on the instrument?
3.72mm
3.50mm
3.30mm
3.28mm
3.22mm
Selitys
Micrometer screw gauge reading = Main scale reading + vernier scale reading
= 3 + 0.22 = 3.22mm