Prove that for a concave mirror, the radius of curvature is twice its focal length.
6. What are the value of (i) angle of incidence (ii) angle of reflection for normal incidence on a plane
mirror surface?
7. What is the minimum number of rays required for locating the image formed by a concave mirror
for an object? Draw a ray diagram to show the formation of image by a concave mirror.
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Explanation:
Spherical mirrors may be concave (converging) or convex (diverging). The focal length of a spherical mirror is one-half of its radius of curvature: \(f = \frac{R}{2}\). The mirror equation and ray tracing allow you to give a complete description of an image formed by a spherical mirror. Spherical aberration occurs for spherical mirrors but not parabolic mirrors; comatic aberration occurs for both types of mirrors.
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