We are able to see objects on the other side of a pane of glass because the glass because the glass is transparent.
We are unable to see what is happening on the other side of a wall because the bricks will not allow light to travel through them. The bricks are opaque.
Some objects allow light to pass through them but scatter the rays of light as they do so. As a result we are unable to see clearly through them. Materials such as these are translucent. Frosted glass is an example of a translucent material.
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