Question

The vernier scale of a travelling microscope has 50 divisions which coincide with 49 main scale divisions. If each main scale division is 0.5 mm, then the least count of the microscope is
A. 0.01 cm
B. 0.5 mm
C. 0.01 mm
D. 0.5 cm

Answer 1

Correct Answer - C
1 MSD=0.5mm
50VSD=49MSD
`1VSD=(49)/(50)MSD`
Least count `=1MSD-1VSD`
`=1MSD-(49)/(50)MSD=(1)/(50)MSD=(1)/(50)xx0.5mm=0.01m`