Using the Gaussian form of the lens equation, a negative sign is used on the linear magnification equation as a reminder that all real images are inverted. The magnification of a lens may be defined as the ratio of the size (height) of the image to the size (height) of the object. The signs associated with magnification also work the same way for lenses and mirrors. 4,211 1 1 gold badge 13 13 silver badges 33 33 bronze badges $\endgroup$ add a comment | 2 $\begingroup$ I have a great deal of sympathy with your position. narini2806 24.05.2019 Physics Secondary School +13 pts. Concave lens … Where f is the focal length of the lens used. Note that in certain cases involving more than one lens the object distance can be negative. When , the image is diminished. Magnification is positive for virtual image and negative for real image. Find an answer to your question Magnification of convex lens is positive or negative 1. Therefore meaning a virtual image (According to physicsclassroom "The negative value for image distance indicates that the image is a virtual image located on the object's side of the lens."). Stay tuned with BYJU’S to learn more about lens formula, magnification, and power of the lens. And v is only negative when the image is on the same side of the lens as the object. If the image is virtual, the image distance will be negative, and the magnification will therefore be positive for the erect image. Join now. Click hereto get an answer to your question ️ Find out the correct option from the following. When , the image is of the same size as that of the object. UKH UKH. Log in. So f is positive for a convex lens and negative for a concave lens. The magnification of a lens is represented by the letter ‘m’. A positive magnification corresponds to an upright image, while a negative magnification corresponds to an inverted image. Thus, m = or m = Where, h 2 = size of image h 1 = size of object. A convex lens can form virtual as well as real images, so the magnification produced by a convex lens can be either positive or negative. Log in. SI unit of power is Dioptre (D). As usual, upright and inverted are taken relative to the orientation of the object. The power of the concave lens is negative, while the power of the convex lens can be positive. When , the image is magnified. The reason is the sign altering of v. share | cite | improve this answer | follow | answered Apr 8 '16 at 0:53. 1. Magnification produced by Concave Lens. Join now. This contradicts the statement above where virtual images = positive magnification. Ask your question. (a) The magnification is positive for all virtual images and is negative for all real images.