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.
Lesson Summary. Let's review. An IQ, or intelligence quotient, is a score you receive on a test that assesses intelligence. The test is typically made up of several sub-tests that look at abilities like verbal, perceptual, processing, and working memory.bout 95.4% of the population will have an IQ score between 70 and 130, which is everyone within two standard deviations. Scores that are between 70 and 85 may be labeled below average, while scores between 115 and 130 could be labeled above average.