Fundamentholfundamenthol

JEE Main 2025 Apr 4 Shift 2, Physics Q13: Measurements

JEE Main2025Apr 4, Shift 2Physics
Q.

For the determination of refractive index of glass slab, a travelling microscope is used whose main scale contains 300 equal divisions equals to 15 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 cm) :

  1. A

    0.001

  2. B

    0.002

  3. C

    0.0005

  4. D

    0.0025

Solution

One main scale division (1 MSD) = cm.

Given , so .

Least count cm.

Concept behind this question

MeasurementsNotes, formulas and examples →

More previous year questions on Measurements

Practice more Physics

Concept-wise practice with instant solutions on Fundamenthol.

Start practicing →