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The circular main scale of a spectromete...

The circular main scale of a spectrometer is divided in to degrees and `30` divisions on the vernier scale occupy the same arc length as `29` divisions of the main scale. The angle of minimum deviation in a prism measured with this spectrometer is found to be `30°`. The probable percentage error in the measurement is nearly A) 0.3% B) 1/9 % C) 1 % D) 0.2 %

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