Opacity (optics)

Opacity is a word that describes how well you can see through an object. Imagine you have a piece of paper and you hold it up to the light. Can you see through it completely? If you can, then the paper is not opaque. But if you can't see through it completely, then the paper is opaque.

Now, when it comes to optics, we use the word "opacity" to talk about how much light can pass through an object. If an object is very opaque, then very little light can pass through it. But if an object is not very opaque, then more light can pass through it.

For example, let's consider the sun. We know that the sun is very bright and gives off a lot of light. But when we look directly at the sun, it's hard to see anything else because the sun's light is very opaque. This means that not a lot of light can pass through the sun and into our eyes.

On the other hand, if we consider a window, we can see through it because the glass is not very opaque. This means that a lot of light can pass through the window and we are able to see what's on the other side.

So, in short, opacity is a way of describing how much light can pass through an object. If an object is very opaque, then very little light can pass through it. If an object is not very opaque, then more light can pass through it.