3 divisions of a simple scale coincide with 5 divisions of another scale. If one division of the simple scale measures 1 mm, then minimum distance that can be measured with the combination of these two scales is
The correct option is D 0.2 mm The question is describing a vernier caliper
Least count of a vernier caliper
L.C=2×V.S.D−1×M.S.D where V.S.D is the Vernier Scale Divison and M.S.D is the Main Scale Division.