The limit is a flat mirror with a focal point at +infty. What does a positive or negative image height or image distance mean? 2. The concave mirror will form a real image, so by convention it's focal length is positive. 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. According to cartesian system focal length of a concave mirror is negative whereas radius of curvature of convex mirror is positive. 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 the plane mirror is at a distance of 24 cm from the object , find the radius of curvature of the convex mirror . NCERT Books. f, the focal length, is positive for a concave mirror, and negative for a convex mirror. In diagram, PF is the focal length of the mirror. Distances measured on the other side are 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 The distance between the pole and the principal focus of the mirror, is called the focal length of the mirror. Sometimes a negative lens is used for a beam expander for a laser and no focus is formed Class 1 - 3; Class 4 - 5; Class 6 - 10; Class 11 - 12; CBSE. The image distance \(d_i\) is positive for real images and negative for virtual images. 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. Any distances measured on that side are positive. The object is placed on the left of the mirror. 1 Verified Answer. Determining the focal length of a concave mirror and the convex lens for a distant object. ... A plane mirror is placed in between , so that the two virtual image so formed coincide . As per the New Cartesian sign convention, 1. Focal length. To figure out what the signs mean, take the side of the mirror where the object is to be the positive side. BOOK FREE CLASS; COMPETITIVE EXAMS. BNAT; Classes. Whether the focal length of a concave mirror is taken as positive or negative depends on the convention being followed. Notice that rule 1 means that the radius of curvature of a spherical mirror can be positive or negative. Principal section. View Answer. The focal length \(f\) is positive for concave mirrors and negative for convex mirrors. It is represented by the symbol f. For mirrors of small aperture, f=R/2. Focal length is defined as the distance between the center of the lens or mirror and the focal point of the lens or the mirror . The diverging lens does not form a real image, but a virtual one, and thus is negative. The answer you get seems to depend on how you "make" your plane mirror as the limit of a convex or concave mirror. The left of the mirror f\ ) is positive and thus is.. 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