I Requirement of two vernier scales in a spectrometer?

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How does the precision of spectrometer get affected by the presence of two vernier scale
 
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Your question is not clear.
 
Khashishi said:
Your question is not clear.
I meant does the presence of two vernier scales instead of one make any difference?
 

Thread 'Mechanism of Energy Conservation in Zero-Amplitude Sum of EM Waveforms'

Assume that this is a case where by sheer coincidence, two sources of coherent single-frequency EM wave pulses with equal duration are both fired in opposing directions, with both carrying the same frequency and amplitude and orientation. These two waves meet head-on while moving in opposing directions, and their phases are precisely offset by 180 degrees so that each trough of one wave meets with the crest of the other. This should be true for both the electric and magnetic components of...
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