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On the E-L equation and Snell’s law for massive particles : a mathematical revisit
D. N. Basu
Variable Energy Cyclotron Centre, 1/AF Bidhan Nagar, Kolkata 700 064, India.
This article describes: (i) the conditions to check whether Euler-Lagrange equation for extremisation provides minimum or maximum and (ii) the derivation of Snell-Descartes law for massive particles which is in contradiction to that for the light waves.