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Q.

A travelling microscope has 20 divisions per cm on the main scale while its Vernier scale has total 50 divisions and 25 Vernier scale divisions are equal to 24 main scale divisions. What is the least count of the travelling microscope?

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a

0.002 mm

b

0.001 cm

c

0.005 cm

d

0.002 cm

answer is C.

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Detailed Solution

1MSD=120cm1VSD=2425MSD=2425×120cm∴ Least count =1201−2425cm=120×125=1500cm=0.002cm

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