Convex mirror, circular mirrorConvex mirrors were a type of reflective mirrors, also known as wide-angle mirrors or turning mirrors. It could be made of a variety of materials and was divided into different specifications according to its diameter, such as 600mm, 800mm, 1000mm, and 1200mm. The circle might be its shape, and it had many uses in different scenarios:
1. In terms of traffic, it was mainly set up at various bends and intersections. Its function was to expand the driver's field of vision, so that the driver could see the road condition of the road blocked by objects. When entering the bend and intersection, it could find the opposite vehicle or pedestrian as soon as possible and avoid it in time to reduce traffic accidents.
2. In supermarkets, shops, shopping malls, and other places, it could be installed in the blind corner of the room to make the place within the monitoring range of the staff, which played an anti-theft role. The principle was to help monitor the light in the blind corner.
3. In factory workshops, enterprises, institutions, and laboratories, personnel could be regulated to remind people to pay attention to safe passage and broaden their horizons. In the underground parking lot, vehicles could know the situation at the other end of the road in time before turning to avoid collisions with vehicles coming from the front.
In terms of the law of optical imaging, when parallel light rays are projected onto a concave mirror, the reflected light rays become scattered light rays. If they extend in the opposite direction of the reflected light rays to the back of the concave mirror, they can converge and intersect at a point. This is the main focus of the concave mirror (F), which is a virtual focus. The image of the concave mirror is a vertical and reduced virtual image.
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Convex mirror, car mirrorThe exterior rearview mirror in a car's rearview mirror usually uses a concave mirror. Convex mirrors could expand the field of vision, allowing drivers to see a wider area, so that they could find vehicles on the opposite side or behind the curve early, which helped to reduce the occurrence of traffic accidents. However, from the reflection of the actual distance, although the concave mirror had a larger visible area, the actual situation was different from what he saw. In the market, there were many different types, prices, and suitable models of car reflective mirrors to choose from, such as frameless round mirrors, high-definition, wide-angle, variable blind spot mirrors, backup auxiliary rearview mirrors, etc.
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MirrorThe Mirror was founded in 1977 by Mr. Xu Simin, a member of the Standing Committee of the National Committee of the Chinese People's Political Conference and a famous person from Hong Kong and Macau. It was a high-quality comprehensive monthly magazine based in Hong Kong. It has published more than 500 issues of journals and has readers in more than 50 countries and regions around the world. The journal adhered to the tenet of "rejuvenating China, honest and daring to speak". It was well-informed, fresh and reliable, and its comments were fair and incisive. It had the style of "I have what others don't have, I have what others have, I have what is new, I have what is new, I have what is fast, and I have what is fast." It became an important window for people to observe and understand the mainland of China, Hong Kong, Macau, Taiwan, and the international community. It played a role in correcting public opinion.
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