Principle of sun protection of sunglasses

Introduction The sun protection principle of sunglasses First of all, I want to say what is the radiation of computers? Basic physics tells every middle school student: when current flows in a conductor, a magnetic field must be generated in space

Principle of sun protection of sunglasses

First of all, I want to say what is computer radiation? Basic physics tells every middle school student: when current flows through a conductor, a magnetic field must be generated in its outer space. Magnetic field lines with a certain amount of energy constantly flow from one magnetic pole to the other. natural environment and in a large artificial magnetic field. If the magnetic field is too strong, it will cause "magnetic pollution" in the human body.

Ultraviolet rays are the general term for radiation with wavelengths between 0.01 and 0.40 microns in the electromagnetic spectrum, which cannot disrupt people's vision. Radiation with a wavelength of 0.01 to 0.04 microns in the electromagnetic spectrum, ranging from the visible violet end tofluorescent lamps, fluorescent lamps, etc.

It seems that many glasses for myopia have anti-radiation lenses, but you need to be careful about what type of film it is. There are blue membranes, purple membranes, green membranes, red membranes, and melanin-spiked eye membranes. In fact, not all membranes are resistant to radiation. It is best to do your research before purchasing them to avoid spending unnecessary money. The first products were green film lenses, mainly to distinguish them from blue film lenses which block infrared rays, but are highly reflective and can be seen behind drivers should not wear them as they are prone to blue shadows. red films. It has anti-ultraviolet and reflection-free effect, but it must protect against radiation. These are of little use. The coating only increasester the light transmission and clarity of the lenses and makes the reflection extremely low. that they are pleasant to wear.

When certain wavelengths of light (here UV-a, UV-B and sometimes infrared) pass through the lens, they cancel out inside the lens, towards the eye. The overlap of light waves is not a coincidence: the crest of one wave and the trough of the adjacent wave cancel each other out. The phenomenon of destructive interference depends on the refractive index of the lens (i.e. the degree of deviation of light rays when passing through different substances in the air), as well as the thickness of The lens. Generally speaking, the thickness of the lens does not vary much, while the refractive index of the lens varies depending on differences in chemical composition. Take melanin bee glasses as an example. Melanin is a natural protective agent that can resist damage caused byhas light. When a strong light shines on the compound eyes of bees, tens of thousands of six-faced bees. are closely arranged. The small eyes reflect strong light and disorderly scattered light and only receive parallel light, so the bees are not afraid of glare. When light hits the bee's eye-shaped dielectric crystal lens, the violet light is reduced based on the so-called "mutual cancellation" process.

Computer radiation does not cancel out. There is no quantity of electromagnetic radiation, only its presence or absence. Whether the protective device can be absorbed and isolated, anti-radiation glasses can only protect the eyes. It should also be combined with insulating cream, cactus, etc. Eat more carrots, bean sprouts, tomatoes, lean meat, animal liver and other foods rich in vitamin A,C and protein, and drink green tea often. Second, after using the computer, many electromagnetic radiation particles will be absorbed on the face. You should wash your face in time with clean water. This will reduce radiation exposure by over 70%! , Do not place stray metal objects inside to avoid re-emitting electromagnetic waves. When using a computer, be sure to adjust the screen brightness. Generally speaking, the brighter the screen, the stronger the electromagnetic radiation, and vice versa. However, it should not be set too dark, so as not to affect the effect due to too low brightness and easily cause eye fatigue. The location of your computer is important. Try not to let the back of the screen face people, as the computer emits the strongest radiation from the back, followed by the left and right sides, and the frontof the screen emits the weakest radiation. As long as the words can be read clearly, the distance should be at least 50cm to 75cm. This can reduce damage caused by electromagnetic radiation.

How to calculate the relative light intensity of solar cells

Don't listen to this friend. If you have no water now, there is no water in the water tank, and the temperature is relatively high, never put cold water on it, there are two solutions. The first: find a good light-blocking reflective material to cover the vacuum tube, wait for the temperature to drop, then put water on it. The second method: The method is the same as above. If the temperature does not drop, wait until evening to drain the water. If you don't do what I do, your solar vacuum tube will most likely burst because the temperature difference is too large and the vacuum tube won't be able to withstand it.

Which floors are 40 meters apart and do not block light

1 First, use a hood to block the light in the dark box and take the light intensity to a horizontal distance of. 20 cm from the white light source as standard light intensity.

2. Then use an optical power meter to measure the light intensity J0 and change the distance x between the solar cell and the light source.

3. Finally, use an optical power meter to measure the light intensity J in x.

The distance between floors40m 26There is no blocking light above the floors.

Generally speaking, if the distance between buildings is 40 meters, you can buy a building above the 26th floor, which will not block light. If the sun can shine into the room, it will not be sensitive to humidity. The distance between buildings is 40 mbeings. If the houses are tilted and offset, the 10th floor will not block light.

Home Buying Options:

1. The best time to buy a house is in a building with more than ten floors, because the noise of the building on the first floor is relatively loud and the lighting is not very good.

2. But don't buy one that is too high, so it is very inconvenient to take the elevator at ordinary times. If the elevator breaks down or has a power outage, going up the stairs will be very difficult. tiring. But don't buy a house on the first or second floor, because the first floor is more humid and noisier.

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