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This sounds like you mean insulators. There's no material which is a perfect thermal insulator.

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10y ago

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What objects block light?

Objects such as walls, doors, and curtains can block light, while transparent or translucent objects like glass or plastic allow light to pass through. Light is also blocked by opaque objects that are thick enough to prevent light from passing through, such as metal sheets or concrete walls.


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Metal objects can block microwaves from penetrating through other objects.


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Do Transparent objects cast shadows?

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