The correction of the refraction for a distance ‘D’ between the st – McqOptions

MCQOPTIONS

1.	The correction of the refraction for a distance ‘D’ between the staff and instrument is _____.
A.	inversely proportional to D
B.	proportional to D
C.	proportional to square of D
D.	proportional to square root of D
Answer» D. proportional to square root of D

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