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Q.

Is it true that wooden doors and blackboards are opaque objects?


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a

True

b

False  

answer is A.

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Detailed Solution

The above statement is true.
Transparency is the property of materials with the help we can see through that material. All materials in nature can be transparent, translucent or opaque. Those materials that do not allow light to pass are called opaque. Nothing is visible through these materials. For example, blackboard and wooden doors are made from opaque material, so nothing is visible through them. This is why whatever is written on the blackboard is visible, and nothing is visible behind them.
 
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