Ray Optics · Reflection
In parallax method for the determination of focal length of a concave mirror, the object should always be placed :
- (1)between the focus (F) and the centre of curvature (C) of the mirror ONLY
- (2)at any point beyond the focus (F) of the mirror
- (3)beyond the centre of the curvature (C) of the mirror ONLY
- (4)between the pole (P) and the focus (F) of the concave mirror ONLY
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See the full 22 Jan 2026, Shift 2 paper
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