find the value of k for which alpha , beta the rofiots of the equation x^2 - 6x + k = 0 satisfy the relation 2 alpha + 3 beta = 20
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the fact or phenomenon of light, radio waves, etc. being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density.
change in direction of propagation of any wave as a result of its travelling at different speeds at different points along the wave front.
measurement of the focusing characteristics of an eye or eyes.
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