A mirror is a smooth surface, and has the ability to reflect light items. The most common mirror is a plane mirror, often used by people to organize the equipment. In science, the mirror is also often used in and telescopes, laser, industrial equipment and other equipment. Surface-polished metal devices with regular reflection properties and metallized reflective films of glass or metal. Often set with metal, plastic or wooden frame. Mirror sub-plane mirror and curved mirror two categories. Curved mirrors have concave mirrors and convex mirrors. They are mainly used as mirror, furniture accessories, architectural decoration parts, optical instruments and components as well as solar cookers, reflector lamps for reflector lamps and searchlights, reflector mirrors and automobile rear-view mirrors.
The mirror's reflection of light obeys the law of reflection, its reflectivity depends on the angle of the incident light, the smoothness of the mirror and the nature of the metallized metal film. The imaginary line perpendicular to the mirror is called the normal line, and the angle between the incident line and the normal line and the angle of the reflection line are equal to the normal line. The object in front of the mirror is an upright virtual image behind the mirror. The distance between the mirror and the mirror is the same as the distance between the mirror and the mirror. If you want to see my whole length from the mirror, because the angle of incidence is equal to the angle of reflection, the mirror must have at least half of my length. The reflective surface of the concave mirror faces the center of curvature.
The parallel rays of light incident on the concave mirror converge to the focal point (f) after reflection, and the focal point is located at half the distance between the center of curvature (c) and the mirror. If the cooker is placed in the focal point of the large concave mirror, it can receive the sunlight to heat and become the solar cooker. Such as the lamp or the searchlight in the light source on the concave mirror focus position can reflect the light parallel light. Objects outside the center of curvature can be reflected as inverted real images, such as reflective telescopes. The convex mirror's reflecting surface faces away from the center of curvature, and the object becomes a reduced erect image behind the mirror, reflecting a wide range of reduced landscapes such as a car rearview mirror.
The surface of the glass is formed by electroless silver plating and vacuum deposition. The most commonly used method is electroless silver plating. This method is to dissolve silver nitrate in water, add ammonia and sodium hydroxide solution and diluted into silver hydroxide ammonia complex salt, made of silver plating solution. To convert sugar or formaldehyde, sodium potassium tartrate solution for the reduction solution. Glass cut, edging (if necessary, also by grinding and polishing), the surface was washed with a dilute stannous chloride sensitization, and then washed, and then silver plating solution and the reduction of liquid mixing immediately immersion surface, the mirror After the formation of washed, then copper and painted protective paint. The vacuum evaporation method is to wash the glass in a vacuum deposition apparatus with a vacuum of 0.1 to 10 Pa to energize the helical tungsten wire to evaporate the helical aluminum alloy into a vapor state at a high temperature to form a mirror surface on the glass surface. You can also use an electron gun instead of tungsten wire heating. Vacuum evaporation can also be smooth metal surface into a mirror.
Family simple make mirror
Plating O. 5 square meters of mirror, need to use silver nitrate 5 grams, ammonia (25%) 10 to 15 ml, sodium hydroxide 2 grams, glucose 1.3 grams, 25 ml of alcohol, a little stannous chloride. First prepared a solution to take silver nitrate placed in a clean, oil-free 500 ml glass, add 100 ml of distilled water, dropping ammonia, while adding side mix. The initial gray precipitate appears; continue to add ammonia to precipitate completely dissolved. After the solution is clarified, 2 g of sodium hydroxide and 50 ml of water-soluble angle is poured into it, and cooled.