Answer: Focal length is the distance between the center of a convex lens or a concave mirror and the focal point of the lens or mirror — the point where parallel rays of light meet, or converge. 1. Parallel light rays that are not parallel to the optical axis will meet on the focal plane. No. We need to find its focal length. Use this online convex mirror equation calculator to find the focal length… Question.40. Note that a lens has a focal point on both sides of the lens axis. Example 3: A concave mirror is made up by cutting a portion of a hollow glass sphere of radius 30 cm. The focal length of the concave mirror is +30 cm. The focal length of (left) a concave lens (with a negative focal length), (middle) a convex lens and (right) a concave mirror. (b) Types: There are two types of spherical mirrors: Concave mirror: Its outer convex surface is polished and inner concave surface reflects. Convex mirrors: as a rear view mirror in automobiles; To produce erect image or smaller size. Focal Length of Spherical Mirrors. A concave mirror produces 3 times a real image of an object placed at a distance of 10 cm in front of it. Since focal length of a mirror does not depend the external medium and wavelength of light. Spherical mirror (a) Definition: A mirror whose surface is cut out of a spherical shell, is called a spherical mirror. f, the focal length, is positive for a concave mirror, and negative for a convex mirror. Explanation: The focus of a concave mirror is defined as number of rays parallel to principal axis when reflected appear to meet at a point on principal axis. Calculate the focal length of the mirror. Is the focal length of a mirror change (i) due to change in medium (ii) or colour of light. The image on a convex mirror is always virtual, diminished and upright. Find the radius of curvature of the mirror. When the image distance is negative, the image is behind the mirror, so the image is virtual and upright. Now we will examine the reflection of light from this type of mirrors and image formation in convex mirrors. Convex mirror: Its inner concave surface is polished and outer convex surface reflects. Concave mirrors are converging light. Convex mirror diverge light, thus negative focal length (focal point=black dot is in virtual space behind the mirror). Thus the focal light should be positive as is the usual convention. The distance between the object and the convex mirror is measured at the point where the image reflection reaches an approximate size of the object. Answer. Click hereto get an answer to your question ️ Define the focal length of a spherical mirror. Let’s start with the reflection of light with special examples. Solution: The radius of curvature of the mirror = 30 cm Thus, the focal length of the mirror =\(\frac { 30 cm }{ 2 } \) = 15 cm The radius of curvature of a convex mirror is 60 cm. When the image distance is positive, the image is on the same side of the mirror as the object, and it is real and inverted. Convex Mirrors We give the definition of convex mirrors in previous sections. In convex mirrors, ray coming parallel to the principal axis goes after reflection as if it comes from the focal point of the mirror.

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