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

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