Why magnification is taken negative for real images and positive for virtual images?( B why convex mirror is used in rear view mirrors and not concave mirror?

Why magnification is taken negative for real images and positive for virtual images?( B why convex mirror is used in rear view mirrors and not concave mirror?

your answer is here ! Explanation: (a) If image is real, it will be inverted which means height of image will be taken as negative. (b) Convex mirror is commonly used in rear view mirrors in vehicles because it gives an erect, virtual, full size diminished image of distant objects with a wider field of view.

Why is the magnification of real images taken as negative and for virtual it is taken as positive?

In the case of a real image, the height of the object carries a positive sign while the height of the image carries a negative one. Hence the magnification is negative. In case of a virtual image, the height of the image, as well as the height of the object, carries a positive sign.

Why is the magnification negative?

A negative magnification indicates that the image is inverted. If the object is placed closer to a converging lens than the focal length, the rays on the far side of the lens diverge. The focal length is positive for a converging lens and is negative for a diverging lens.

When the magnification became negative the image is real?

The negative sign for the magnification, and the image height, tells us that the image is inverted compared to the object. To summarize, the image is real, inverted, 6.2 cm high, and 17.7 cm in front of the mirror.

Why magnification of concave mirror is negative?

Magnification is negative in a concave mirror. The magnification of a concave mirror is given by the ratio of the height of the image to the height of the object. Hence, if the image is inverted and real the magnification will be negative.

When magnification is positive or negative?

When the image formed is virtual and erect, magnification is positive. And, when the image formed is real and inverted, magnification is negative.

Why is magnification always positive for a concave lens while can be positive or negative for a convex lens?

(b) This is because image formed by a convex lens may be real and inverted for some positions of the object and image formed may also be virtual and erect for some other positions to the object. …

Is magnification of virtual image negative?

(a) The magnification is positive for all virtual images and is negative for all real images. (b) The magnification of concave lens and convex mirror is always positive where as the magnification of convex lens and concave mirror can be positive or negative depending on the position of the object before the lens.

Is magnification positive or negative?

Magnification of a convex mirror is always positive , but that of a concave mirror may be both positive or negative . This magnification can tell us about the nature of the image based on the sign itself. If the ratio is negative then the image is real and inverted.

Is magnification positive or negative in concave mirror?

When does magnification become negative?

Why is magnification positive for concave lens?

Concave lenses always form virtual images, so magnification produced by a concave lens is always positive. A concave lens always forms the image smaller than the object, so |m|<1.

Which mirror is concave if magnification is negative?

A negative magnification implies a real image. Real images are not obtained in plane mirrors and convex mirrors. They are obtained only in concave mirrors. Hence, we conclude that if the value of the magnification is negative, the mirror used is concave.

Why is the magnification of a convex lens negative?

When a convex lens forms a real image, the magnification is considered negative. This is simply because the image is inverted. However, when a convex lens is used as a magnifier (when the object distance is less than the focal length such as in the picture below) then the virtual image is upright and therefore has a positive magnification.

Is the magnification of rear view mirror positive or negative?

So, Magnification will be positive. (b) Convex mirror is commonly used in rear view mirrors in vehicles because it gives an erect, virtual, full size diminished image of distant objects with a wider field of view. Thus, convex mirrors enable the driver to view much larger area which is not possible with a concave mirror.

Can magnification be negative when V is negative?

From what I understand currently, magnification is positive when the image is erect. An image is only erect when it is a virtual image, therefore virtual images = positive magnification. Vice versa, magnification is negative when the image is inverted, therefore a real image. However using the equation m = v/u, m is negative when v is negative.