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.
IQ stands for Intelligence Quotientâ¦ It is a ratio, therefore, of a personâs intelligence compared to the mean (average). The average IQ is 100, which stands for a ratio of 1:1 - the further the deviation (higher or lower than 100), the further a person falls from the norm. In reality, though, IQ scores are generally distributed on a bell curve, with approximately 68% of people falling within the 85â115 category.