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.
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Your IQ, which stands for Intelligence Quotient, is a scientific assessment of your intelligence derived from standardized tests that measure problem solving abilities, spatial imagery, memory, general knowledge, and other factors. Make sure the book is in your reading level. 2  Reading something that is too easy for you doesn't do anything but entertain, and while you may increase your IQ by reading a novel beyond your reading level, constantly referring to a dictionary will sap the joy out of reading.