Asked by Jean

If you place a glass test tube in water, you can see the tube. If you place it in clear soybean oil, you may not be able to see it. What does this indicate about the speed of light in the oil and in the glass?
Answered by drwls
When the speeds of light are equal in the two materials, rays of light are not bent when passing from one to the other, and transparent objects will nearly or completely disappear.
Answered by Anonymous
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