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A device with minimum count is the most suitable to measure length.
(a) Least count of vernier callipers
= 1 standard division (SD) – 1 vernier division (VD)
(b) Least count of screw gauge =
(c) Least count of an optical device = Wavelength of light ∼ 10–5 cm
= 0.00001 cm
Hence, it can be inferred that an optical instrument is the most suitable device to measure length.
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