Caleb is sitting near the window on a sunny day. When he closes the curtain, the room becomes darker. What property of the curtain allows it to make the room darker?

The curtain has light absorbing ability

Explanation:

It is a well known fact that light waves that are visible have a range of wavelengths or even frequencies. If for instance, a lone frequency light wave hits an item, there are events that could occur as a result. The wave could possibly be reflected by the item it hit, the light wave could possibly be transmitted by the material it hit or could even be absorbed by the material. This is certainly the case with the curtain that Caleb was sitting near to.

The curtain has the ability to absorb the light and not transmit it. This is most likely what resulted to the room becoming darker than when the curtain was not closed.

Answer:The curtain absorbs light.

Explanation:

The darker the curtain the more light it absorbs, the darker the room becomes also the curtain becomes hot. The lighter the curtain, the more light it reflects, the lighter the room becomes.