(a) 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?
Answers
Answer:
(a)
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.
(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.
Answer:
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.
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.
Explanation:
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