Why are concave magnets taken in motors and generators?
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usually you want to minimize the air gap between the field magnets and the armature, so convex magnets if they are on the rotor (the usual case) and concave if they are on the stator. Convex and concave on one axis only.
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Image Formation: most images formed by concave mirrors are REAL and are located on the same side of mirror as that of the object. Let us not forget that REAL IMAGES are INVERTED relative to the orientation of the object. In order to view a real image, one needs a screen, such as a cinema screen. So now you need a screen placed (most probably) in the back-seat of the vehicle. Try to envision the difficulties you will face in observing rear traffic on a screen that is behind you in the back seat! AND the image is INVERTED! In the special case where the image provided by the concave mirror is virtual (and, thank goodness, ERECT), it would require that the rear traffic be located within the focal length of the mirror. The focal length has to be GREATER than your vehicle’s length (else you can’t see an image unless it’s too late and the rear vehicle has rear-ended yours and it’s actually rammed in the back seat of your vehicle!) For safety’s sake, the concave mirror would have a focal length of at least 16 meters to achieve a “safe” virtual, magnified, image. This would require a radius of curvature of 32 meters. In general, such a radius is considered infinite, and that takes us into the realm of PLANE MIRRORS which I suppose your dome rear-view mirror is!
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