Question

Define Opaque material​

Answer 1

An opaque object is something that allows no light through it. Concrete, wood, and metal are some examples of opaque materials. Some materials can be opaque to light, but not to other types of electromagnetic waves.

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Answer 2

$ans. \: \: Opaque \:  objects \: block \: light \: from \: traveling \: through \\ \: them. \: Most \: of \: the \: light \: is \: either \: reflected \: by \\ \: the \: object \: or \: absorbed \: and \: converted \: to thermal \: energy. \:  Materials \:  such \\ \: as \: wood, \: stone, \: and \: metals \: are \:  opaque \:  to \: visible \: light.$