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A light ray composed of two monochromati...

A light ray composed of two monochromatic components passes through a trihedral prism with refracting angle `theta = 60^(@)`. Find the angle `Delta alpha` between the components of the ray after its passage through the prism if their respective indies of refraction are equal to `1.515` and `1.520`. the prism is oriented to provide the least deflection angle.

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