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