Let me explain this in a bit more detail. This makes the window act as if it were a mirror. However, at night, there is very little sunlight from outside, meaning that it is simply easier to see the light coming from inside that gets reflected off the window. How Does a Window Turn Into a Mirror At Night?Ī window does not turn into a mirror at night anymore than it does during the day. In particular, why a window acts almost like a mirror when it’s dark outside. Now, understanding this fact is key in order to understand what happens to a window when it’s dark. Some of it, albeit a fairly small amount, will get reflected. This, of course, applies to glass as well, meaning that no window is perfectly transparent, letting all of the light through it. At least such a material has not been discovered so far. Generally, any time there is a transition of light moving from one material to another (in this case, from air to glass), there will be both reflection and refraction happening (refraction is the phenomenon where light travels through the material but its direction, wavelength and speed will change).įundamentally, this occurs because no material acts as “perfectly transparent” (well, apart from possibly dark matter, but nobody knows yet). This is why it is possible to see a fuzzy reflection of yourself in a window, even during the day if you look closely. When light transitions from air to glass, most of it gets refracted, however, a small amount will also get reflected. So, does a window then actually reflect light?Ī window reflects a small percentage of the light that hits it. However, this is not completely true because even glass is not perfect. When most people think of a window (or glass), they think of something that’s transparent.
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