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Question: A spherometer has 20 threads per cm. Its circular scale has 100 divisions. Find the least count of s...

A spherometer has 20 threads per cm. Its circular scale has 100 divisions. Find the least count of spheometer

A

5 μm

B

50 μm

C

0.5μm

D

0.05μm

Answer

5 μm

Explanation

Solution

Least count = number of division on circular scale

0.12=0.5×10−3 cm\frac { 0.1 } { 2 } = 0.5 \times 10 ^ { - 3 } \mathrm {~cm}