Forensic scientists immerse glass evidence into a medium to determine its refractive index. Which medium is usually used for determining the refractive index?

Vacuum

Explanation:

The refractive index is usually found by finding the ratio between the speed of light in a vacuum and the speed of light in the given medium (glass in this case).

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under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

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