For a concave mirror, you only need two rays: one parallel to the principal axis that reflects through the focus, and one through the focus that reflects parallel. As for all six positions... yaar, in twenty years of teaching village kids, I've never once had a student need that bookish list for their life. What they need is how one ray works, to fix a solar cooker. My real lesson is that too much theory is like too many tourists—it just creates a noisy crowd, when a little quiet understanding is enough.
#exams#study
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