The more dense the medium, the slower the light moves.
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Having read the above passage, choose the right answer to the following question (choices are wool or cotton ):


If Mona shines a light through both wool and cotton and determines that cotton is less dense then wool, which material will the light move faster through wool or cotton?
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multiple-choice question answering
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The more dense the medium, the slower the light moves.
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{{context}}

Having read the above passage, choose the right answer to the following question (choices are wool or cotton ):


If Mona shines a light through both wool and cotton and determines that cotton is less dense then wool, which material will the light move faster through wool or cotton?
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cotton