The Critical Angle Derivation. So the critical angle is defined as the angle of incidence that provides an angle of refraction of 90-degrees. Make particular note that the critical angle is an angle of incidence value. For the water-air boundary, the critical angle is 48.6-degrees.
The average IQ is 100. Have you wondered what your IQ score is? Our original IQ Test will give you a fast, free and accurate iq score. Take our quick free IQ test and find out just how smart you are. What others had to say... A person's Intelligence Quotient (IQ) is, arguably, one of their most important characteristics.
The average American IQ ranges between 90 and 100. Individuals with IQ scores between 160 and 165 are considered extraordinary geniuses, and those with scores of 145 to 179 are considered geniuses. A score of 115 to 144 is considered above average, and scores between 85 and 114 are considered average. Continue Reading.