# magnification of concave mirror is positive or negative

SitemapCopyright © 2005 - 2020 ProProfs.com. B) The image is inverted and the mirror is convex. According to the new Cartesian sign conventions, magnification for a convex mirror is positive because image formed by a convex mirror is always virtual and erect. In the question it is given that the object size is magnified 4 times, and not the distance of the of the object from the mirror. If the image is above the principal axis of the convex mirror, the image height (h ‘) is positive (image is upright). What would happen if you stand in front of a convex mirror, at the same distance from it as its focal length? What is this part of an aircraft (looks like a long thick pole sticking out of the back)? Why does concave mirror simultaneously form two images? This is simply because the image is inverted. I found that a method I was hoping to publish is already known. if the sign changes the lens cannot become a convex lens, what is true in mathematics cannot be true in giving sufficient inference. My planet has a long period orbit. The formula for magnification is = height of image / height of object = -1 However, if an image is behind the mirror, the situation is different. Can a player add new spells to the spellbooks described in Tasha's Cauldron of Everything? How can I make the seasons change faster in order to shorten the length of a calendar year on it? concave mirrors have positive $f$ and convex mirrors have negative $f$. Why does a spoon form a virtual image though it is a concave mirror? In any case, a convex mirror will have a negative focal length. To learn more, see our tips on writing great answers. Stay tuned with BYJU’S to learn more about spherical mirrors, surface tension and much more. Which diagram correctly shows a ray of light passing through a rectangular glass block? $u=-x$ ,here $x$ is the value of object distance, as per sign convention $x$ becomes $-x$ because $x$ is being left of the mirror. Magnification - Thin Lenses: M is negative when image is? What did The Weeknd mean in his lyric "bring the 707 out"? Can everyone with my passport data see my American arrival/departure record (form I-94)? In a concave mirror, the magnification is the ratio of the height of the image to the height of the object. Virtual images will be located behind the mirror surface. MathJax reference. for magnification, positive values indicate that the image is the same orientation as the object (object upright, image also upright), negative if the image is inverted relative to the object. since u is assigned a negative value $-x$, then $v$ must also be a negative value if the image is real (now the information is given to you). As the concave lens the image will be always virtual and erect if magnification is positive. What is the difference between Astrophysics and Cosmology? Are lizards from the same family as dinosaurs? proper use of the formula $m=\frac{-v}{u}$ will yield a negative value for m, indicating an inverted image relative to the object. However, if an image is behind the mirror, the situation is different. Which state of matter has the most energy? Unfortunately, many solution sets not written with the intention of being a primary teaching tool. Magnification of a concave lens or a convex mirror is always positive because they always form virtual and erect images. The expression which gives t… for mirrors, both being on the same side of the mirror means they have the same property. Thanks for contributing an answer to Physics Stack Exchange! inverted and … What is the distance between the positions of the original and final images seen in the mirror if an object... What will happen if light travels from medium 1 to medium 2 and speed of light is less in medium 2? Great example of how to answer homework question: help in understanding without feeding the solution. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Answer. Help in understanding the use of the present subjunctive use of sein, Fedora shows / mounted at the same location as home. if one is real and the other virtual, they must have different sign. In any case, a convex mirror will have a negative focal length. What is the difference between FHSS and DSSS? Focal length of Convex Lens is positive Focal length of Concave Lens is negative Since object is always in front of the lens, object distance is always negative If a real image is formed, image is formed on right side, so image distance is positive If a virtual image is formed, image is formed on left side, so image distance is negative Strongly recommend that you draw a diagram; the issue of signs is very well explained in @Gregsan's answer, and together with diagram should lead to solution/understanding. C) The image is inverted and the mirror is concave. Why did mainframes have big conspicuous power-off buttons? upright and on the same side of the lens as the object.

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