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A spectrometer gives the following reading when used to measure the angle of a prism. Main scale reading: 58.5 degree Vernier scale reading: 09 divisions Given that 1 division on main scale corresponds to 0.5 degree. Total divisions on the Vernier scale is 30 and match with 29 divisions of the main scale. The angle of the prism from the above data is
- 58.59 degree
- 58.77 degree
- 58.65 degree
- 59 degree
Correct answer: 58.65 degree
Solution
Least count = (1 MSD - 1 VSD) = (1 - 29/30)*0.5 deg = 0.5/30 deg per division. Angle = 58.5 + 9*(0.5/30) = 58.5 + 0.15 = 58.65 deg.
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