If it lets NO light through it can not even give a blurry view, so your question makes no sense and cannot be answered.
When a material is opaque, it means that it does not allow light to pass through it. This makes the material not transparent or translucent, so you cannot see through it. Opaque materials block the transmission of light.
When light cannot travel through a material, it has been absorbed or blocked by the material. This typically occurs when the material is opaque and not transparent or translucent.
An optically opaque material.
An example of a material you cannot see through is wood. Wood is typically opaque, meaning that light cannot easily pass through it, unlike transparent materials like glass or plastic. This opacity is due to the arrangement of fibers in wood that block the transmission of light.
Light cannot pass through an opaque material.
If it lets NO light through it can not even give a blurry view, so your question makes no sense and cannot be answered.
When a material is opaque, it means that it does not allow light to pass through it. This makes the material not transparent or translucent, so you cannot see through it. Opaque materials block the transmission of light.
When light cannot travel through a material, it has been absorbed or blocked by the material. This typically occurs when the material is opaque and not transparent or translucent.
a fanny
translucent
Water cannot pass through tyvek. Water vapor can however but liquid water cannot. Tyvek is high-density polyethylene fiber and is a synthetic material.
Insulators
That material would be included in the category of electrical "insulators".
You cannot see air. Light passes through it.
An optically opaque material.
An example of a material you cannot see through is wood. Wood is typically opaque, meaning that light cannot easily pass through it, unlike transparent materials like glass or plastic. This opacity is due to the arrangement of fibers in wood that block the transmission of light.