Mirror Optical properties
Optical properties editing
The reflection of the mirror against the light obeys the law of reflection, and its reflection ability depends on the angle of the incident light, the smoothness of the mirror and the nature of the metal film being plated. 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 plane of the mirror in front of the mirror after the virtual image, like the distance from the mirror and the distance between the object and the mirror equal. If you want to see the whole length from the mirror, because the angle of incidence is equal to the reflection angle, the mirror must have at least half of my length. The reflecting surface of the concave mirror faces the center of curvature.
The parallel light is incident on the concave mirror and then converges to the focal point (f), where the focal point is at 1/2 of the center of curvature (c) and the mirror. Such as cooking utensils placed in the focus of the large concave mirror position, can accept solar heating, become a solar cooker. Such as lights or searchlight light source placed in the concave mirror focus position can reflect the light parallel light. Objects in the center of curvature can be reflected in the inverted image, such as reflective telescope. The convex surface of the convex mirror is the center of the curvature of the curvature, and the object is reduced in front of the mirror. It can reflect a wide range of reduced landscapes, such as car mirrors
Manufacturing method editor
The surface of the glass-formed reflective imaging surface is chemically silver-plated and vacuum-evaporated. The most commonly used is the silver plating method. 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 by cutting, grinding (if necessary, grinding and polishing), the surface after washing, with stannous chloride dilute solution sensitized, and then washed, and then mixed with silver plating solution and reducing solution immediately immersed surface, mirror After the formation of washed, then can be coated with copper and protective paint. Vacuum evaporation method is to wash the glass, placed in the vacuum of 0.1 ~ 10Pa evaporation device, the spiral tungsten wire power, the high temperature of the spiral aluminum alloy into a gaseous, deposited on the glass surface to form a mirror. You can also use an electron gun instead of tungsten wire heating. Vacuum evaporation method can also be a smooth metal surface processed into a mirror.
Family simple making mirror
Plating 5 square meters of the mirror, need to use silver nitrate 5 grams,
Ammonia (25%) 10 to 15 ml, 2 grams of sodium hydroxide, 1.3 grams of glucose, 25 ml of alcohol, a little stannous chloride. First prepared a solution of silver nitrate placed in a clean oil-free 500 ml glass, add 100 ml of distilled water dissolved, add ammonia, while add side edge. The initial gray precipitate appears; continue to add ammonia to the precipitate completely dissolved. Solution after the clarification of 2 grams of sodium hydroxide plus 50 ml of water-soluble angle into the cooling can be.
Raw materials and requirements:
Glass should be flat, no bubbles in the middle of the transparent glass;
Silver nitrate, the content of 99.5% or more;
Ammonia, the concentration of 25-28%;
Potassium tartrate, to be pure chemical.
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