Calculate the critical angle between diamond (n = 2.42) and quartz (n = 1.46)?
23°
37°
52°
60°
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Ответ:
37°
Explanation:
Total internal reflection is a phenomenon that occurs when a ray of light is moving from a medium with higher index of refraction to a medium with lower index of refraction; in this case, there exist a value of the angle of incidence (called critical angle,
) above which no refraction occurs, and all the light is reflected back into the original medium.
The value of the critical angle between two mediums is given by the formula:
where
In order to have total internal reflection, it must be
.
In this problem:
Substituting, we find the value of the critical angle:
Ответ:
C.) I,II,III
Explanation: