A prism constitute of a transparent, homogeneous and isotropic medium with the index of refraction n1 is placed in air as shown on the figure on the image a) Express Snell's law of refraction in terms of i, i', r, r' and n at the point I and I' of the prism when rays pass through it's principal plane section b) Determine the geometric relation that link the angle A to r and r'

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