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In the pencil example, the basis is the distance between the:
AHands
BFeet
CEyes
DEars
Answer & Solution
Correct answer: C. Eyes
1. The two observation points are the two eyes.
2. The basis is the separation of those points.
3. So it is the distance between the eyes.
_Source: NCERT Class 11 Physics Part I, Chapter 2, Units and Measurement._
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