The particle is said to be transparent, if the photons are not absorbed by the substance. And thus, the photons can easily pass through the substance. If the particles absorb photons, they are not transparent. And that particles are said to be opaque (wall). This is due to the presence of gaps between the electrons in the atoms of the particles. If the gap between the two electrons in the orbit of the particles are less, then the photons can be easily absorbed by the electrons. And the object becomes opaque. If the gap between two electrons are more, then the photons may escape, they are not absorbed by the electrons, making the object transparent.
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