alleryThe plane through F normal to the principal axis is called the:
APolar plane
BAxial plane
CImage plane
DFocal plane
Answer & Solution
Correct answer: D. Focal plane
1. A tilted parallel beam focuses off the axis.
2. It still lands in a particular plane through F.
3. That is the focal plane of the mirror.
_Source: syllabus Physics Part II, Chapter 9, Ray Optics and Optical Instruments._
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