Find angle that satisfies the following

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snellslaw
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I get how to go from 5 to 6 (set cosα=0) but how do you get 7?
Thanks!
 
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  • Three numbered equations from a derivation: (5) R^2 + d^2 - 2Rd cos α = (q/q')^2 (R^2 + d'^2 - 2Rd' cos α); (6) d^2 + R^2 = (q/q')^2 (R^2 + d'^2); (7) dR = (q/q')^2 (d'R). Text between them reads the surface must be equipotential.
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