What is the index of refraction of a medium if the critical angle is 40.0°, assuming the second medium is air?

Explanation:

The refractive index of a medium (n) is defined as angle of refraction per angle of incidence. When the angle of incidence in water reaches a certain critical value, the refracted ray lies along the boundary, having an angle of refraction of 90-degrees. This angle of incidence is known as the critical angle which was given to us; 40.0°.  Then we subtitute the value in the equation to get the R.I of the medium.

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

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