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JEE Main 2022 Physics question

PhysicsUnits and MeasurementJEE Main 2022

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 m.

Answer: 5

Solution

One main scale division is M = 1/40 cm = 0.025 cm. With 50 VSD = 49 MSD, the least count is

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Question ID VK-025222