Physics Question from JEE Main 2025 · 4 April, Shift 2

For the determination of refractive index of glass slab, a travelling microscope is used whose main scale contains $300$ equal divisions equals to $15 \, \text{cm}$. The vernier scale attached to the microscope has $25$ divisions equals to $24$ divisions of main scale. The least count (LC) of the travelling microscope is (in $\text{cm}$):