We can partially see through fog but cannot see through the door because:
Door is transparent and fog is opaque.
Door is brown in colour.
Door is opaque and fog is translucent.
Door is translucent and fog is transparent.
Door is opaque; we cannot see through it. Fog is translucent; we can see through it partially.
Is the human body transparent/translucent/opaque?
We cannot see through the door because: