For the determination of the refractive index of a glass slab,a travelling microscope is used whose main scale contains $300$ equal divisions equal to $15 \ cm$. The vernier scale attached to the microscope has $25$ divisions equal to $24$ divisions of the main scale. The least count $(LC)$ of the travelling microscope is (in $cm$):
- A$0.001$
- B$0.002$
- C$0.0005$
- D$0.0025$
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Identify the physical quantity that cannot be measured using a spherometer:
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