#Definition #Properties #Examples #Concave #Mirrors
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Jakarta, CNN Indonesia —
A concave mirror is a type of mirror with an inward curved surface. Thanks to these characteristics, concave mirrors have benefits, one of which is as a device optics.
So that you better understand what a concave mirror is, consider the definition, properties and examples of tools mirror sunken.
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What is a concave mirror?
Reporting from the book Easy and Active Learning Physics, a concave mirror is a mirror that has a surface that is curved inward or concave. Its curved shape like the inside of a ball makes a concave mirror converge or collect light.
The surface shape of a concave mirror is different from that of a flat mirror or a convex mirror. Plane mirrors have a flat surface while convex mirrors have a surface that curves outward.
A concave mirror has the characteristic that the image is always virtual, upright and reduced.
Properties of concave mirrors
There are several characteristics that differentiate concave mirrors from other types of mirrors such as flat and convex mirrors. Following are the properties of a concave mirror.
1. Convergent
Reporting from the book Integrated Science: Biology, Chemistry, Physics Class VIII Volume II, a concave mirror has convergent properties, which means it collects light to a focal point. The center of the circle that forms part of the mirror is called the center of curvature.
Meanwhile, the line that passes through the center of the mirror and the center of curvature is called the principal axis. Any light that comes parallel to the principal axis will be reflected.
After that, these rays will intersect at a point called the focal point, therefore the concave mirror can collect light that comes parallel.
2. The focus value of a concave mirror is always positive
Reporting from the book Optics – Preparation for the Physics Olympiad by Prof. Yohanes Surya, concave mirrors are often called positive mirrors because of their ability to focus light into a real point.
A concave mirror in the shape of a bowl with an inward curved surface reflects light and focuses it on a real focal point in front of the mirror. This produces realistic and enlarged images.
3. Shadow
The nature of the image of an object formed by a concave mirror depends on the position of the object in relation to the mirror. If the object is close, the image is upright, false (virtual), and larger than the original.
But if the object is far from the concave mirror, then the image is real or real and inverted.
Example of a concave mirror
The following are some examples of using concave mirrors.
1. Myopia glasses
Myopic glasses or myopia (near-sighted) glasses use concave lenses because they can help focus the image precisely on the retina of the eye.
This is because myopia glasses have an inward curve or curve which makes the light passing through the glass meet at one focus point, resulting in clear vision or vision.
2. Mouth mirror
A mouth mirror is used by dentists to examine the patient’s teeth and mouth using a concave mirror. With a long handle, this mirror allows you to reach the inside of the patient’s mouth.
Meanwhile, a concave mirror allows it to reflect light and form an enlarged image of areas of the mouth that are difficult to see.
3. Center
Flashlights are considered concave mirrors because their design utilizes the principle of light refraction by a concave mirror to produce focused light. In a flashlight, a lamp or light source is placed near the focal point of a concave mirror.
4. Vehicle lights
Vehicle lights include concave mirrors because they use the principle of light refraction by a concave mirror to produce a directional light pattern. In vehicle headlights, the light source is placed near the focus of the concave mirror.
That is the definition, properties and examples of concave mirrors. Hope it is useful.
(may/fef)
