Physics · 2025
JEE Main · 4 April 2025, Shift 2 · Q26
For the determination of refractive index of glass slab, a travelling microscope is used whose main scale contains 300 equal divisions equals to 15…
For the determination of refractive index of glass slab, a travelling microscope is used whose main scale contains $\displaystyle 300$ equal divisions equals to $\displaystyle 15$ cm. The vernier scale attached to the microscope has $\displaystyle 25$ divisions equals to $\displaystyle 24$ divisions of main scale. The least count (LC) of the travelling microscope is (in cm) :
Official answer
From NTA’s final answer key for this paper.
(2)
$\displaystyle 0.002$
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JEE Main 2025 Physics question, with the answer from NTA’s final answer key. Where our answers come from.