{"id":3211,"date":"2018-12-18T05:42:16","date_gmt":"2018-12-18T00:12:16","guid":{"rendered":"https:\/\/cbselibrary.com\/?p=3211"},"modified":"2020-12-18T16:19:47","modified_gmt":"2020-12-18T10:49:47","slug":"concave-and-convex-mirrors","status":"publish","type":"post","link":"https:\/\/cbselibrary.com\/concave-and-convex-mirrors\/","title":{"rendered":"What are Concave and Convex Mirrors?"},"content":{"rendered":"

What are Concave and Convex Mirrors?<\/strong><\/h2>\n

We are used to plane mirrors<\/a>. But, when they are curved, they produce images that are different from those formed by plane mirrors. Common examples of curved mirrors stainless steel spoons, ladles, vessels with round bases, car mirrors, shaving and hub caps of car wheels. These curved objects have two types of reflecting surfaces one that bulges out to form a convex surface, and one that curves inwards to concave surface. The first one is called a convex mirror<\/strong> and the latter is a concave mirror<\/strong>.<\/p>\n

    \n
  1. A curved mirror is actually a mirror with a curved reflective surface. A curved mirror has the same shape as a section of a large sphere as shown in Figure.\"What
    \n\"What<\/li>\n
  2. If the outside surface of the section reflects, the mirror is a convex mirror. If the inside surface reflects, the mirror is a concave mirror.
    \n\"What<\/li>\n
  3. The principal axis<\/strong> of a curved mirror is the line passing through its vertex, P<\/strong> and the centre of curvature, C.<\/li>\n
  4. The centre of curvature<\/strong>, C<\/strong> of a curved mirror is the centre of the sphere that forms the curved mirror.<\/li>\n
  5. The radius of curvature<\/strong>, R<\/strong> of a curved mirror is the radius of the sphere.<\/li>\n
  6. A concave mirror<\/strong> curves inwards<\/strong>. Parallel light rays that hit the concave surface are reflected inwards as shown in Figure.
    \n\"What<\/li>\n
  7. The focal point<\/strong> or the principal focus<\/strong>, F of a concave mirror is the point on the principal axis where the reflected rays converge, or in other words, meet and intersect. This is a real focus<\/strong>.<\/li>\n
  8. A concave mirror is also known as a converging mirror<\/strong>.<\/li>\n
  9. A convex mirror<\/strong> curves outwards<\/strong>. Parallel light rays that hit the convex surface are reflected outwards as shown in Figure.
    \n\"What<\/li>\n
  10. The focal point, F of a convex mirror is the point on the principal axis where the reflected rays diverge, or in other words, appear to spread out from behind the mirror. This is a virtual focus<\/strong>.<\/li>\n
  11. A convex mirror is also known as a diverging mirror<\/strong>.<\/li>\n
  12. The focal length, f<\/strong> of a curved mirror is the distance from its vertex, P to its principal focus, F.
    \nThe focal length of a curved mirror is equal to half of the radius of curvature, that is = R\/2<\/li>\n<\/ol>\n

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