Use of concave and convex mirrors. How to use a concave mirror
A concave mirror is a mirror with a convergent designation, which is a mirror that is used for many purposes, for example, for the purposes of reflecting light. In an airplane landing at the airport, this concave mirror serves to guide an airplane, for example when it is about to take off or take off.
The use of mirrors is also often found in barbershops because it is used by barbers to get enlarged and upright images of the face.
Concave mirrors are also used in car headlights to reflect light, are used in marine lighthouses found at seaports and at airports to guide ships, and are used in solar ovens.
There are systems of solar ovens and solar furnaces to collect large amounts of solar energy in a mirror focus for cooking food, heating water, charging power reserves, or melting metals respectively.
Concave mirrors are also found on satellite dishes, these mirrors are commonly used in telescopes, dentists and ENT doctors use them to get bigger than a real picture of teeth, ears or skin, etc. Concave mirrors are used in electron microscopy and magnifying glasses.
Benefits of a concave mirror
Real image and virtual image, The actual image is formed as a result of the intersection of reflected light rays, It is acceptable on the screen and it is always inverted.
The virtual image is formed as a result of the intersection of the extension of the reflected light rays. It is unacceptable on the screen and always upright (upright).
How to Focus on a Concave Mirror
The focus of a concave mirror is generated due to the collection of reflected rays emitted from a distant object such as the sun. The rays after being reflected collect in a single point of light which is called the focus of the mirror that can be received on the screen.
Mathematically, the distance between the mirror focus and the mirror pole is = ½ the radius of curvature of the mirror and it is called the mirror focal length.
When the incident light ray is parallel to the main axis, It reflects past the focus, When the incident light beam passes through the focus, It reflects parallel to the main axis, When the incident light ray passes through the center of curvature, It reflects itself back.
The case of image formation by a concave mirror
When the position of the object is very far away, the position of the image is in focus, The image is real and very small (dot).
Objects are at a distance greater than the radius of curvature (after the center of curvature), Images are at a distance greater than the focal length but less than twice the focal length (between focus and curvature), Real images, inverted and reduced (small ).
When you place an object at the center of the curvature of the mirror (at a distance equal to the radius of curvature), it will appear that the image will be at the center of the curvature, the image will be real, inverted and the same as the object.
When the object is between the center of curvature and focus (at a distance greater than the focal length but less than the radius of curvature), the image appears at the center of curvature (at a distance greater than the radius of curvature), the image is real, inverted and enlarged (enlarged).
When the object is between the focus and the poles (at a distance less than the focal length, Image is behind the mirror, Image is virtual, upright (upright), and magnified. When the object is in focus, No image is formed, Image is at infinity where the rays penetrate as parallels.
How to use a convex mirror
Convex mirrors are used as side-view mirrors on the passenger side of the car because they form an upright, smaller image for the road behind the car. Convex mirrors are suitable for convenience stores and large supermarkets and any other corner where need anti-thief, used in turning off roads and parking lots.
Convex mirrors are used in buildings, They are also used in making the lenses of sunglasses, They are used in magnifying glasses, They are used in securities and they are used in telescopes. They can be used as street light reflectors because they can scatter light over a larger area.
Convex mirrors that you often find on street corners will be of great help to other road users. This convex mirror makes it possible to see every car that comes to avoid collisions.
Wherever the position of the object in front of the convex mirror, the image is smaller than the object, It is upright (upright), It is virtual (not accepted on the screen).
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