Question

In a hypothetical vernier calipers $10$ equal divisions on the vernier scale coincide with $6$ main scale divisions. If one division of main scale is $0.5mm$ then the least count is

• A. $0.1mm$
• B. $0.02mm$
• C. $0.3mm$
• D. $0.4mm$

Answer 1

The correct option is C $0.3mm$

least count of vernier calipers is given by,

$\frac{6}{10}\times 0.5mm$

$=0.6\times 0.5mm$

$=0.3mm$