Opacity is the quality, the characteristic of opaqueness that some objects and materials present.
When a body or object is opaque, that is, it has opacity as a salient feature, it is because light does not pass through it, since they largely block it.
There are specific issues that influence the determination of the opacity of an object or material, on the one hand, the frequency of light and on the other hand the temperature of the object in question.
Opacity is plausible to be studied via infrared radiation, gamma rays, ultraviolet rays and the famous X-rays. This is so because in reality the opacity of something cannot be measured based on the light that it lets see in a simple glance. and therefore it is necessary to use various methods and elements to measure it accurately.
The opposite situation is that of a translucent body or object, in which case it is characterized by allowing light to pass easily, while transparent objects are capable of letting light pass completely.
So in opacity there is an almost total blocking of the passage of light, in the case of translucent elements there is a fairly important but not absolute passage of light and in transparent elements the light passes by one hundred percent.
On the other hand, the concept of opacity is widely used in the paper industry, since through it it is called one of the qualities of this material so used in our culture for writing, for printing ...
At the behest of the paper there will be a part of the light that is reflected on it, another part passes through it and the other will be absorbed by it. In this context, the light that passes to the paper will be called transparency and the one that does not become opaque.
Fillers and pigments increase the opacity of the paper.
Whenever we have an image on the paper, its opacity will need to be increased to prevent the passage of light through it.
