One centimeter on the main scale of vernier callipers is divided into ten equal parts. If 10 divisions of vernier scale coincide with 8 small divisions of the main scale, the least count of the callipers is
L.C.= Value of one main scale division – Value of one vernier scale division
= 1 mm – 8/10 mm
= 1 mm – 0.8 mm
= 0.2 mm or 0.02 cm