alice7 wrote:
I got a question about D. SO I was down between A and D. I rejected D because it says visible equipment, such as lights. Lights is not visible equipment and doesn't make sense. I dont understand this part. And Hence picked A.
I am not sure whether you are pointing at the scientific fact that light itself is invisible - if so then you have a misunderstanding of the meaning conveyed in the sentence. Here light is an equipment (not the wave). When a light (the equipment) is on you can visually make
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