How to Use the Word Concave in a Sentence

A concave shape has a curved surface that bulges inward. It is the opposite of a convex shape, which has a curved surface that bulges outward. Concave shapes are often used in architecture and design because they can create an illusion of space and make objects appear larger than they actually are. For example, concave mirrors are often used in stores to make items in the back of the store appear closer than they actually are.

Shaving mirrors

There are many different types of shaving mirrors on the market, so it is important to find one that suits your needs. Some mirrors are designed to be used in the shower, while others are meant to be used at the sink. There are even some mirrors that come with suction cups, so that you can attach them to any smooth surface.

When choosing a shaving mirror, it is important to consider the size and shape of your face. You will also want to think about how often you shave and whether or not you need a magnifying mirror. If you have sensitive skin, then it is especially important to find a mirror that will not cause irritation.

Once you have found the perfect shaving mirror, be sure to take care of it properly. Clean it after each use and store it in a safe place when not in use. With proper care, your shaving mirror should last for many years.

Head mirrors

A head mirror is a handheld, convex or concave reflective surface suspended on a headband. It is used by medical professionals in order to obtain an unobstructed view of the ears, nose and throat.

The first recorded use of a head mirror was in 1869 by Sir Morell Mackenzie. He used it to examine the throat of Napoleon III. The use of head mirrors became popularized in the early 20 t h century as ENT surgeons began using them routinely to visualize the nasal cavity and paranasal sinuses.

There are many different types of head mirrors available on the market today. They vary in size, shape and reflectivity. There are even some head mirrors that come with built-in lighting so that doctors can see even better into dark areas.

Head mirrors are an essential tool for any ENT surgeon or doctor who needs to get a good look at the inside of a patient’s nose, throat or ear. They provide clear views without any obstructions and can help doctors diagnose and treat various conditions quickly and effectively.


An ophthalmoscope is a medical instrument used to examine the interior of the eye. It is used to check for abnormalities such as cataracts, glaucoma, and retinal detachment. The ophthalmoscope is also used to assess the health of the optic nerve and blood vessels in the retina.

Astronomical telescopes

Reflecting telescopes, which use mirrors to capture and focus light, are also used for astronomical observations. Both types of telescope can be used to study planets, stars, galaxies, and other objects in the universe.


While most people think of headlights as simply a way to see in the dark, there are actually many different uses for them. For example, headlights can be used to blind oncoming traffic, making it easier to pass or make a turn. They can also be used to illuminate a dark road so that you can see what’s ahead of you. Additionally, some people use their headlights as an emergency signal if their car breaks down on the side of the road.

Solar furnaces

Solar furnaces concentrate the sun’s rays using mirrors or lenses to produce high temperatures. The heat can be used for a variety of industrial processes or to generate electricity. Solar furnaces are usually large structures with a reflective surface that focuses the sun’s rays on to a central point.

Solar furnaces have been used for manufacturing glass and steel, desal in ating water, and generating electricity. In glassmaking, the high temperatures produced by solar furnaces can melt s and into glass. Steel can also be produced using solar furnace technology; the heat from the sun is used to melt scrap metal which is then formed into new steel products.

Water desalination is another important application of solar furnaces; by heating salt water to high temperatures, the salt crystallizes and can be separated from the water molecules. This process produces fresh water that can be used for drinking or irrigation purposes. Solar furnace technology has also been used to generate electricity; in this case, the heat from the sun is used to produce steam which drives turbines connected to an electrical generator.

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