Should the Olympic flame be held with a concave mirror or a convex mirror?
Should the Olympic flame be held with a concave mirror or a convex mirror? The Olympic torch relay ceremony must be held before the opening of each Olympic Games. Fire was collected from the square in front of the Temple of Hera in Olympia, Greece. So, should the Olympic flame be taken with a concave mirror or a convex mirror? Whether to use a concave mirror or a convex mirror for the Olympic flame, choose 1
There is a concave mirror.
Concave mirrors are a type of spherical mirror. They use the inner surface of the ball as a reflecting surface and have a converging effect on light.
After the sunlight is reflected by the concave mirror, the reflected light will converge on the focus. The temperature at the focus will be extremely high, igniting the torch.
The saint dressed in white walked solemnly and slowly towards the Holy Fire Platform, where a bright flame ignited.
After 12:00 local time, the fire for the Beijing Winter Olympics was successfully collected in the ancient Olympia town on the Peloponnese Peninsula in Greece, the birthplace of the Olympic movement. In front of the ruins of the Temple of Hera with a history of more than 2,000 years, the Olympic flame was once again lit for Beijing.
Today's sacred fire gathering ceremony was held at the ruins of the Temple of Hera in Olympia, which was the venue for the ancient Olympic Games from the 8th century BC to the 4th century AD.
At 11:30 local time today, the sun's rays focused on the center of a concave mirror to ignite the sacred fire. The flame was lit by Xanthi Georgiou, who played the role of priestess.
Greek President Sakralopoulou, International Olympic Committee President Bach, Greek Olympic Committee President Capralos and Beijing Winter Olympics Organizing Committee Vice Chairman Yu Zaiqing*** also attended the day's meeting Gathering Ceremony.
As the COVID-19 epidemic is still raging, the Greek Olympic Committee has previously announced that the lighting ceremony will be held in strict accordance with local health regulations. Both ceremonies at the ruins of ancient Olympia and the Panathenaic Stadium will have no live audiences and only officially recognized people will be able to enter, with a maximum of 200 people at a time.
It is reported that after the lighting ceremony is held at the ruins of ancient Olympia, the Beijing Winter Olympics fire will be transferred to the Acropolis of Athens and stay there overnight. Tomorrow morning local time, the flame will be transported to the Panathenaic Stadium and then handed over to the Beijing 2022 Winter Olympics delegation. Afterwards, the torch will be transported to Beijing via chartered flight.
International Olympic Committee President Bach accepted an interview with CCTV reporters in Ancient Olympia, the Peloponnese Peninsula in Greece, the birthplace of the Olympic Games. Praising the preparations for the Winter Olympics, Bach said frankly: "We are very impressed by China's response to the epidemic. China is determined to contain the epidemic, not only to contain the virus, but also to eliminate the virus. In response to the epidemic, During the process, we have seen China's efficiency. Despite many epidemic restrictions, the preparations for the Beijing Winter Olympics have made positive progress. All venues were completed a few months ago and are now being tested safely. The feedback from athletes after participating in the test competition was very positive, so we are confident in the success of the Beijing Winter Olympics." Bach also revealed that the Beijing Winter Olympics has entered the countdown stage, and the International Olympic Committee The focus of the work is currently on the organization and operation of the competition and epidemic prevention measures. "We are now discussing with the Beijing Winter Olympics Organizing Committee, relevant Chinese departments and international experts to ensure that everyone can enjoy the competition in a safe way." Whether to use a concave mirror or a convex mirror for the Olympic flame, choose 2
per The Olympic Torch Relay Ceremony must be held before the opening of an Olympic Games. The fire was collected from the square in front of the Temple of Hera in Olympia, Greece. The beautiful and elegant priestess placed the torch burner in the center of a concave mirror facing the sun. After a while, the torch was lit. Why can a concave mirror light a torch even if there is no fire in it? Mathematical principles are also used here.
It turns out that this concave mirror is a parabolic mirror, and its shape is obtained by rotating a parabola around its axis of symmetry. Parabolas have an important property: straight lines parallel to the axis of symmetry converge at the focus of the parabola after being reflected by the parabola. The interior of the parabola that collects the sacred fire is coated with a reflective layer. When it faces the sun, the sun's rays are parallel to the symmetry axis of the parabola. After being reflected by the parabola, the sunlight is concentrated at the focus of the parabola, making the temperature at the focus very high. It can reach The ignition point of the torch fuel. The priestess placed the torch's burner at the focus of the concave mirror, so that the reflected sunlight ignited the torch.
A parabola can reflect and focus parallel light rays at the focus. On the contrary, the light emitted by a light source placed at the focus will also become parallel rays after being reflected by the parabola. For example, our commonly used flashlights, car headlights, and searchlights all have parabolic reflectors. In addition, satellite television receiving antennas, radar antennas, and radio astronomy telescope antennas also have a rotating paraboloid. Because the TV signal from the satellite is already very weak when it reaches the earth, the parabolic antenna reflects the received signal at the focus, which can enhance the strength of the signal. The signal is received by the feed placed at the focus, and after amplification, denoising, decoding and other processing, the signal is transmitted to the TV, and we can watch wonderful satellite TV programs.
The electromagnetic waves emitted from the feed source can be propagated in a direction after being reflected by the antenna, and the electromagnetic signals reflected back from objects in that direction can also be detected. Radar works based on this principle. The larger the diameter of the antenna, the stronger the received signal and the better the effect.