JEE Main 2024 Physics question

In finding out refractive index of glass slab the following observations were made through travelling microscope: 50 vernier scale division = 49 MSD; 20 divisions on main scale in each cm. For mark on paper MSR = 8.45 cm, VC = 26. For mark on paper seen through slab MSR = 7.12 cm, VC = 41. For powder particle on the top surface of the glass slab MSR = 4.05 cm, VC = 1. (MSR = Main Scale Reading, VC = Vernier Coincidence). Refractive index of the glass slab is:

• (A)1.42Correct
• (B)1.52
• (C)1.24
• (D)1.35