A sodium atom radiates for 4 x 10-8 s. What is the coherence length of light from a sodium lamp? *
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(a) Least count of vernier callipers
= 1 MSD - 1 VSD
= 1 MSD - 19/20 MSD = 1/20 MSD
= 1/20 mm = 1/200 cm = 0.005 cm
(b) Least count of screw gauge pitch / no of divisions on circular scale
= 1 / 100 mm = 1 / 1000 cm = 0.001 cm
(c) Wavelength of light λ = cm
= 0.00001 cm
Thus, clearly the optical instrument is the most precise
体寒可是
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