Ray 1 approaches parallel to the axis, ray 2 strikes the center of the mirror, and ray 3 approaches toward the focal point. (credit: Mike Melrose, Flickr). Note that its large magnitude helps spread out the reflected energy. The distance between the pole and the principal focus of the mirror, is called the focal length of the mirror. You can use the mirror formula also to get the focal length of a … Where is the filament of the light in relation to the focal point or radius of curvature of each mirror? Light is reflected from the cornea, which acts like a convex mirror, and the keratometer measures the magnification of the image. Focal Length - The distance between the pole P of the concave mirror and the focus F is the focal length of the concave mirror. This is analogous to a case 2 image for lenses ( do
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