When you want to keep light out.
Ex: Curtains to keep out light when you sleep.
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they form clearer objects
An opaque object does not reflect light. Opaque objects absorb light.
They are special.
metal and wood
There are many objects that no light can pass through, although of course, it depends on what type of light you're talking about. The name of the type of object that visible light cannot pass through is called opaque.