Car Moc
Car Moc
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Curved mirror
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Reflections in a spherical convex mirror. The photographer is seen reflected at top right
A curved mirror is a mirror with a curved reflective surface, which may be either convex (bulging outward) or concave (bulging inward). Most curved mirrors have surfaces that are shaped like part of a sphere,[citation needed] but other shapes are sometimes used in optical devices. The most common non-spherical type are parabolic reflectors, found in optical devices such as reflecting telescopes that need to image distant objects, since spherical mirror systems suffer from spherical aberration.
Convex mirror
A convex mirror diagram showing the focus, focal Length, centre of curvature, principal axis, etc
A convex mirror, fish eye mirror or diverging mirror, is a curved mirror in which the reflective surface bulges toward the light source. Convex mirrors reflect light outwards, therefore they are not used to focus light. Such mirrors always form a virtual image, since the focus F and the centre of curvature 2F are both imaginary points "inside" the mirror, which cannot be reached. Therefore images formed by these mirror cannot be taken on screen. (As they are inside the mirror)
A collimated (parallel) beam of light diverges (spreads out) after reflection from a convex mirror, since the normal to the surface differs with each spot on the mirror.
Image
Convex mirror image formation
The image is always virtual (rays haven't actually passed though the image), diminished (smaller), and upright . These features make convex mirrors very useful: everything appears smaller in the mirror, so they cover a wider field of view than a normal plane mirror does as the image is "compressed".
Uses
Convex mirror lets motorists see around a corner.
The passenger-side mirror on a car is typically a convex mirror. In some countries, these are labelled with the safety warning "Objects in mirror are closer than they appear", to warn the driver of the convex mirror's distorting effects on distance perception.
Convex mirrors are used in some automated teller machines as a simple and handy security feature, allowing the users to see what is happening behind them. Similar devices are sold to be attached to ordinary computer monitors.
Camera phones use convex mirrors to allow the user correctly aim the camera while taking a self-portrait.
Properties of convex mirror can be found in objects not specifically designed for this purpose, such as some thumb tacks, Christmas baubles and even sunglasses.
Concave mirrors
A concave mirror diagram showing the focus, focal Length, centre of curviture, principal axis, etc.
A concave mirror, or converging mirror, has a reflecting surface that bulges inward (away from the incident light). Concave mirrors reflect light inward to one focal point, therefore they are used to focus light. Unlike convex mirrors, concave mirrors show different types of image depending on the distance between the object and the mirror itself.
These mirrors are called "converging" because they tend to collect light that falls on them, refocusing parallel incoming rays toward a focus. This is because the light is reflected at different angles, since the normal to the surface differs with each spot on the mirror.
Image
Effect on image of object's position relative to mirror focal point
Object's position (S),focal point (F)
Image
Diagram
S < F(Object between focal point and mirror)
Virtual
Upright
Magnified (larger)
S = F(Object at focal point)
the image is formed at infinity.
(Note that the reflected light rays are parallel and do not meet the others. In this way, no image is formed or more properly the image is formed at infinity.)
F < S < 2F(Object at 2x focal point)
Real
Inverted (vertically)
Magnified (larger)
S = 2F
Real
Inverted (vertically)
Same size
S > 2F
Real
Inverted (vertically)
Diminished (smaller)
Mirror shape
Most curved mirrors have a spherical profile. These are the simplest to make, and it is the best shape for general-purpose use. Spherical mirrors, however, suffer from spherical aberration. Parallel rays reflected from such mirrors do not focus to a single point. For parallel rays, such as those coming from a very distant object, a parabolic reflector can do a better job. Such a mirror can focus incoming parallel rays to a much smaller spot than a spherical mirror can.
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