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Opaque materials do not allow light to pass through them.
opaque
opaque
Transparent materials allow light to freely pass through them. Translucent materials also allow light to pass through them, but change the colour of the light.
Materials that allow energy to flow easily through it are called conductors.
Superconductors are materials that let current or electricity pass through them. Insulators are materials that don't allow current or electricity to pass through them. Superconductors are mostly all metals. Insulators are wood, plastic, and paper.
Opaque materials do not allow light to pass through them.
Transparent materials will always allow light to pass through, translucent materials will allow light to pass through as well but the light rays will be scattered. Opaque materials will not allow any light to pass through.
They reflect or absorb light and thus do not allow light to pass through.
opaque
opaque
Translucent materials allow some light to pass through. Transparent materials allow most or all light to pass through.
Transparent materials allow light to freely pass through them. Translucent materials also allow light to pass through them, but change the colour of the light.
Insulators
copper
permeability
permeability