A travelling microscope is used to determine the refractive index of a glass slab. If 40 divisions are there in 1 cm on main scale and 50 Vernier scale divisions are equal to 49 main scale divisions, then least count of the travelling microscope is x10 -6 m.
Text Solution
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CHECK THE SOLUTION.
(5)
50 VSD = 49 MSD
1VSD = 
MSD
Least count = 1 MSD - 1 VSD
MSD = 
MSD
1MSD = 
cm
Least count = 
cm
= 0.5x 10 -5 m
= 5 x 10 -6 m
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