Critical angle can refer to:
- Critical angle (optics) the angle of incidence above which total internal reflection occurs
- Critical angle of attack, in aerodynamics; the angle of attack which produces the maximum lift coefficient
- Critical angle of repose, in engineering; the steepest angle of descent of a slope when the material is on the verge of sliding
Famous quotes containing the words critical and/or angle:
“It would be easy ... to regard the whole of world 3 as timeless, as Plato suggested of his world of Forms or Ideas.... I propose a different view—one which, I have found, is surprisingly fruitful. I regard world 3 as being essentially the product of the human mind.... More precisely, I regard the world 3 of problems, theories, and critical arguments as one of the results of the evolution of human language, and as acting back on this evolution.”
—Karl Popper (1902–1994)
“It is a mistake, to think the same thing affects both sight and touch. If the same angle or square, which is the object of touch, be also the object of vision, what should hinder the blind man, at first sight, from knowing it?”
—George Berkeley (1685–1753)