alleryA common sign convention lets one formula handle mirrors that are:
ASpherical
BFlat only
CSquare cut
DCylindrical
Answer & Solution
Correct answer: A. Spherical
1. Concave and convex cases would otherwise need separate rules.
2. The convention makes one formula serve them all.
3. That single formula covers spherical mirrors.
_Source: syllabus Physics Part II, Chapter 9, Ray Optics and Optical Instruments._
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