A.none of the above
B.error due to refraction only
C.error due to curvature only
D.error due to both curvature and re-fraction
Explanation: The correct answer is error due to both curvature and re-fraction.
Submitted by: Academy of Pakistan
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Submitted by: Academy of Pakistan
Submitted by: Academy of Pakistan
Submitted by: Academy of Pakistan
Submitted by: Academy of Pakistan
Submitted by: Academy of Pakistan
Submitted by: Academy of Pakistan
Submitted by: Academy of Pakistan
Submitted by: Academy of Pakistan
Submitted by: Academy of Pakistan
Submitted by: Academy of Pakistan
Submitted by: Academy of Pakistan
Submitted by: Academy of Pakistan
Submitted by: Academy of Pakistan
Submitted by: Academy of Pakistan
Submitted by: Academy of Pakistan