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The Concave Mirror And The Convex Mirror
Uses
of the concave mirror and the convex mirror in our daily life
BY
HEBA SOFFAR
Uses
of the concave mirror
It is used as a torch to reflect the light.
It is used in the aircraft landing at the
airports to guide the aeroplanes,
It is used in shaving to get an enlarged
and erect image of the face.
The concave mirror is used in front lights
of cars to reflect the light.
It is used in marine lighthouses that are
found at the marine ports and at the airports to guide the ships and it is used
in the solar ovens.
The concave mirror is used in the solar
ovens and the solar furnaces to collect a large amount of solar energy in the
focus of the mirror for cooking food, heating water, recharging power backups,
or melting metals respectively.
Concave mirrors are used in satellite
dishes.
They are used in telescopes, dentists and
ENT doctors use them to obtain a larger image than the original of the teeth,
ear or skin, etc.
Concave mirrors are used in the electron
microscopes and magnifying glasses.
They are used in the visual bomb detectors
and they are used in the flashlight mirror of the camera.
Real
image and Virtual image
The real image is formed as a result of the
intersection of the reflected light rays.
It can be received on a screen and it is
always inverted.
The virtual image is formed as a result of
the intersection of the reflected light rays extensions.
It can not be received on a screen and it
is always erect (upright).
The
focus of the concave mirror
The focus of the concave mirror is produced
due to the collection of the reflected rays emitted from a far object such as
the sun.
The rays after being reflected collect in
one lit point which is called the focus of the mirror that can be received on
the screen.
The distance between the focus of the mirror
and the pole of the mirror = ½ the radius of mirror curvature and it is called
the focal length of the mirror.
When the incident light ray is parallel to
the principal axis.
It reflects passing through the focus. When
the incident light ray that passes through the focus, it reflects parallel to
the principal axis.
When the incident light ray that passes
through the center of curvature, It reflects back on itself.
Cases
of formation of the images by the concave mirror
When the position of the object is very
far, the position of the image is at the focus, the image is real and very tiny
(dot).
The object is at a distance greater than
the radius of curvature (after the center of curvature).
The image is at a distance greater than the
focal length but less than the double of focal length (between the focus and
the curvature).
The image is real, inverted and diminished
(small).
When the object is at the center of
curvature (at a distance equals the radius of curvature), the image will be at
the curvature center.
The image will real, inverted, and equal to
the object.
When the object is between the center of
curvature and the focus (at a distance more than the focal length but less than
the radius of curvature), the image is after the center of curvature (at a
distance greater than the radius of curvature), the image is real, inverted and
enlarged (magnified).
When the object is between the focus and
the pole (at a distance less than the focal length, the image is behind the
mirror, the image is virtual, upright (erect), and magnified.
When the object is at the focus, no image
is formed, the image is at infinity where the rays penetrate as parallel.
Uses
of the convex mirror
The convex mirror is used as side-view
mirror on the passenger’s side of a car because it forms an erect and smaller
image for the way behind the car.
The convex mirror is suitable for
convenient shop and big supermarket and any other corner where need anti-thief,
it is used in the turning off the road and parking.
Convex mirrors are used inside the
buildings.
They are also used in making lenses of
sunglasses.
They are used in the magnifying glass.
They are used in securities and they are
used in telescopes.
They can be used as street light reflectors
because they can spread the light over a bigger area.
They are put on the corners of roads so
that you can see any cars coming to avoid the collisions and they are used as
ceiling dome mirrors.
Properties
of the formed image by the convex mirror
Wherever the position of the object in front of the convex mirror, the image is smaller than the object, it is upright (erect), it is virtual (not received on a screen).
Name
: Heba Soffar
Job : Telecommunication Engineer
Faculty of Engineering
Alexandria University
Electrical Engineering Department
B.Sc.Project : Wave propagation in Random and Deterministic Media
Country : Egypt
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