alleryThe distance of the principal focus from the pole is the:
AFocal length
BFocal line
CFocal limit
DFocal level
Answer & Solution
Correct answer: A. Focal length
1. It is written as f in the formula.
2. It sits between the pole and the focus.
3. It is the focal length.
_Source: syllabus Science, Ch 10 'Light - Reflection and Refraction'_
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