Which of the following is true about the index of refraction? a) it is always equal to 1.00. b) it can be equal to 1.00 but it can also be less than 1.00. it is never greater than 1.00. c) it can be equal to 1.00 but it can also be greater than 1.00. it is never less than 1.00. d) it can never be equal to 1.00

c) It can be equal to 1.00 but it can also be greater than 1.00. It is never less than 1.00.

Explanation:

Refractive index is equal to velocity of the light 'c' in empty space divided by the velocity 'v' in the substance.

Or ,

n = c/v.

Since speed of the light 'v' in any medium is always be less than or equal to speed of the light in the vacuum 'c', thus, the index of refraction is always be greater than or equal to 1.0.

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

mass and volume are the answers you are looking for