Prove that if incident ray passes through focus, reflected ray will be parallel to principal axis (use geometry)
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Rule 1: After reflection, a ray of light parallel to the principal axis appears to be coming from focus. Rule 2: A ray of light going towards centre of curvature is reflected back along the same path. Rule 3: After reflection, a ray of light going towards the focus becomes parallel to the principal axis.
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this explanation is not geometrically..
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