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The mirror part is that thin reflective layer of metal behind the glass. The glass is there for two reasons: 1) It provides strength for this extremely thin layer, 2) It protects that layer from damage. Glass is chosen because it is transparent - you can see through it.
Ectoplasm
Early settlers placed diverging reflective or mirrored surfaces behind oil lamps on walls to help to better increase their radiance by reflecting the light that would otherwise be hitting the wall.
A physical thing that is transparent allows light to pass through. Clear glass or plastic, even if tinted, is transparent. You can see objects clearly and with a great deal of detail when looking through something that is transparent. Think of the similarites of the words appearance and transparent. Objects that are translucent allow light to pass through, but the light is so diffused that objects cannot be seen. A sheet of ordinary paper is an example. You can hold a sheet of paper up to a light and you can easily see that light passes through it. but you cannot see with any kind of detail what is behind the paper.
Yes, glass is a translucent because translucent means permitting light to pass through. Some glass is also transparent, because images of items behind the glass can be seen. Some glass, because of substances mixed into it, are opaque and don't even allow any light at all to get through. Most of what we ordinarily think of as glass is transparent.
The mirror part is that thin reflective layer of metal behind the glass. The glass is there for two reasons: 1) It provides strength for this extremely thin layer, 2) It protects that layer from damage. Glass is chosen because it is transparent - you can see through it.
It's a small silvery cylinder behind / under the dasboard.
Ectoplasm
Yes, they are mostly transparent and behind the content of document.
Early settlers placed diverging reflective or mirrored surfaces behind oil lamps on walls to help to better increase their radiance by reflecting the light that would otherwise be hitting the wall.
Something which is translucent will allow light to pass through it although the form behind the object cannot be identified as in something which is transparent. Examples being: frosted glass is translucent, clear glass is transparent.
The light heats it up to the point where it undergoes a mini-explosion, and is then referred to as a "popcornea". Just kidding. The cornea is transparent, and does nothing else except transmit and focus light, a function a bit like that of the crystalline lens behind it.
Whenever light, while traveling through a medium such as air, encounters a substance with a different index of refraction, some light will pass and some will reflect off the surface. The angle, and the difference in the two indexes will determine the reflective properties of the glass. Specifically, light is composed of alternating electromagnetic waves. When you solve Maxwell's equations for these waves encountering a surface, reflection is discovered.
A mirror is formed by a glass plate with a reflective coating behind it. A mirror reflects the right that hits it, thereby forming an image of what is in front of the mirror.
The salt is left behind.
You injure your vital coccyx.
A lot of practice.