Focal length of Convex Lens is positive. The limit is a flat mirror with a focal point at +infty. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Verify your number to create your account, Sign up with different email address/mobile number, NEWSLETTER : Get latest updates in your inbox, Need assistance? A concave mirror has a +ive focal length, and as you make it more and more flat, the focal point moves away from the surface. On the other hand, for a convex mirror, the opposite obtains: you get a flat mirror with a focal point at -infty. Contact us on below numbers. a photographic lens or a telescope), the focal length is often called the effective focal length (EFL), to distinguish it from other commonly used parameters: The focal length of the convex mirror is positive, whereas that of the concave mirror is negative. If a virtual image is formed, image is formed on left side, so image distance is negative. Example 6: A 1.4 cm long object is placed perpendicular to the principal axis of a convex mirror of focal length 15 cm at a distance of 10 cm from it. If a real image is formed, image is formed on right side, so image distance is positive. Focal length of plane mirror is at infinity. Focal length of plane mirror is (a) at infinity (b) zero (c) negative (d) none of these, The radius of curvature and focal length of a concave mirror are (a) positive (b) negative (c) both (d) none of these, The object distance in both concave as well as convex mirror is (a) negative (b) positive (c) zero (d) none of these, Focal length of plane mirror is (a) at infinity (b) zero (c) negative, A mirror that has very wide field view is (a) concave (b) convex (c) plane (d) none of these. … Explain the rules for the ray diagram for spherical lenses. Afraid of a subject or a topic? Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. The same can also be proved by using the mirror formula: (1/f = 1/v +1/u). For a thick lens (one which has a non-negligible thickness), or an imaging system consisting of several lenses or mirrors (e.g. focal length of plane mirror is infinity. Kindly Sign up for a personalized experience. Define New Cartesian Sign convention, object/image distance, lens formula,... Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day. Focal length of Concave Lens is negative. Focal length of plane mirror is positive or negative Ask for details ; Follow Report by Tvfaisal2368 29.06.2019 Log in to add a comment Notice that rule 1 means that the radius of curvature of a spherical mirror can be positive or negative. Want a call from us give your mobile number below, For any content/service related issues please contact on this number. The radius of curvature and focal length of a concave mirror are (a) positive (b) negative (c) both (d) none of these asked Apr 1, 2019 in Physics by Farrah ( … The focal length f is positive for concave mirrors and negative for convex mirrors. Calculate the following : (i) location of the image (ii) height of the image (iii) nature of the image Solution: (i) For a convex mirror, focal length is positive. Don’t worry, let us know and we will help you master it. Draw a ray diagram and also state the position. An object is placed between infinity and the pole of a convex mirror. Is the focal length of plane mirror positive or negative - Physics - TopperLearning.com | w19mimtt The image distance di is positive for real images and negative for virtual images. Since object is always in front of the lens, object distance is always negative. Copyright Notice © 2020 Greycells18 Media Limited and its licensors. All rights reserved.