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Concave Mirrors
Object faces inward part
Focus is always on the inward part (in this case, in front of mirror.)
Convex Mirrors
Object faces outward part
Focus is always on the inward part (in this case, behind the mirror.)
How to draw ray diagrams for concave…
1st Line: Horizontal line then through focus.
2nd Line: To middle then (i=r).
3rd Line: Through focus then horizontal.
(Only need two, but three is better.)
How to draw ray diagrams for convex…
1st Line: Horizontal then virtual through focus.
2nd Line: To focus then virtual horizontal
3rd Line: To middle then (i=r)
(Only need two, but three is better.)