Unformatted text preview: F = R / 2 Focal Length of a convex mirror F = - R / 2 The Principle of Reversibility If the direction of a light ray is reversed, the light retraces it's original path. Image Formation By a Convex Mirror Ray 1: This ray is initially parallel to the principal axis and therefore appears to originate from the focal point F of the mirror. Ray 2: This ray heads toward F , emerging parallel to the principal axis after re±ection. Ray 3: This ray travels toward the center of curvature C ; as a result, the ray strikes the mirror perpendicularly and re±ects back on itself. Mirror Equation 1/d o + 1/d i = 1/f d i is negative for an image behind the mirror, as it 1 of 1 5/16/09 12:54 PM...
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- Fall '08
- RICHARDSON, B
- Geometrical optics, wave fronts, concave mirror Focal