A student perform experiment to measure thickness of slab by using vernier caliper. 50 scale of vernier is equal to 49 scale of main scale. He observes that zero of vernier is between 7.00 cm and 7.05 cm 23rd division of vernier coincide with main scale. What will be thickness of slab measured by student?

Options

A. `7.73 cm`
B. `7.23 cm`
C. `7.023 cm`
D. `70.73 cm`

Explanation

No. of division on main scale = a = 49
No. of division on vernier scale = b = 50
Least count `=((b-a)/(b))M`
where `M=7.05-7.00 =0.05 m`
`=(50-49)/(50)M`
`=(1)/(50)xx0.05`
`=0.001 cm`
`:.` Thickness of slab
`=7.00+I.C` (No of division)
`=7.00+0.001xx23`
`=7.00+0.23=7.023 cm`