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JEE Main 2022 · 26 Jun · Shift 2, Physics question 59

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 ______ ×10−6\times10^{-6} m.

Answer and worked solution

Official answer: 5

Main scale division 140\frac1{40} cm =0.25=0.25 mm. Least count =MSD50=0.005=\frac{\text{MSD}}{50}=0.005 mm =5×10−6=5\times10^{-6} m.

Answer: 5

Topics:Vernier callipers and screw gaugeLeast count
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