Magnification is positive for virtual image and negative for real image. Concave lens … So f is positive for a convex lens and negative for a concave lens. This contradicts the statement above where virtual images = positive magnification. The signs associated with magnification also work the same way for lenses and mirrors. Log in. When , the image is diminished. If the image is virtual, the image distance will be negative, and the magnification will therefore be positive for the erect image. Click hereto get an answer to your question ️ Find out the correct option from the following. As usual, upright and inverted are taken relative to the orientation of the object. 1. Where f is the focal length of the lens used. 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. 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."). UKH UKH. Ask your question. The reason is the sign altering of v. share | cite | improve this answer | follow | answered Apr 8 '16 at 0:53. 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. The magnification of a lens is represented by the letter ‘m’. Find an answer to your question Magnification of convex lens is positive or negative 1. Thus, m = or m = Where, h 2 = size of image h 1 = size of object. (a) The magnification is positive for all virtual images and is negative for all real images. narini2806 24.05.2019 Physics Secondary School +13 pts. Magnification produced by Concave Lens. Stay tuned with BYJU’S to learn more about lens formula, magnification, and power of the lens. Join now. When , the image is magnified. 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. SI unit of power is Dioptre (D). A positive magnification corresponds to an upright image, while a negative magnification corresponds to an inverted image. Log in. The power of the concave lens is negative, while the power of the convex lens can be positive. Note that in certain cases involving more than one lens the object distance can be negative. Join now. And v is only negative when the image is on the same side of the lens as the object. When , the image is of the same size as that of the object. 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.