Opaque

Real World Example

Imagine trying to have a conversation with a friend over the phone, but there's no signal, and your words don't reach them at all. This situation is similar to how opaque materials behave with light—they completely block any light from passing through, just as the lack of a signal prevents your voice from getting through. In both cases, whether it’s your voice or light, the intended message or beam is stopped entirely, leaving no way for it to continue to the other side.