Discussion
The ratio of the speed of light in vacuum to that in a medium is called
Answer: D
The ratio is the refractive index of the medium.
The absolute refractive index is defined as \(n = \frac{c}{v}\), the speed of light in vacuum divided by its speed in the medium. Since light is slowest in dense media, \(n\) is greater than 1 for them.
Luminous intensity and luminous flux are photometric measures of light output, magnification is a property of images, and 'transparency index' is not a standard term.
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