(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
Explanation:
real images are inverted so it forms image downwards,so its magnification is taken negative .
positivr because they form up.
★Convex mirrors are used as it produces wide range of view.
Explanation:
For a real image, the magnification is always negative since the image formed is always inverted whereas for a virtual image, the magnification is taken positive since the image formed is erect.
Convex mirrors are used in car rear view mirrors as they form a smaller image of the object. Convex mirror can therefore be used to view a much larger area than it would be possible with concave mirror. Concave mirror on the other hand forms magnified and inverted image of the object. This would form an image of a smaller area and would also inverted which would be hard to understand.
Thus, convex mirrors are used in car rear view mirror.
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