And the Lord said, "Let there be light," and there was light. He/she/it saw that it was . . . bent . . . and verily backed he/she/it away therefrom to ponder. Upon seeing that this anamoly would bring forth much confusion and concern among his/her/its creations he/she/it summoned forth one of the angels who lurked there about and gave him/her/it instruction. "Goeth ye down to the earth and the inhabitants thereof with this sacred law that I shall giveth thee and there thou shalt deliver it unto one who shall be named Snell and thou shalt instruct him to diseminate this law hither and yon to all the lowly students of Physics 101 so they may go forth into the world and enlighten the inhabitants thereof regarding this apparent error in my divine creation. Thou shalt admonish the one called Snell that he is to make it clear that the law worketh in both directions, yea going in and coming out, and that it is universal to all things that possesseth a property I shall call optically clear wherein I have limited the speed of light to less than that of the heavens. He shall call the ratio between these two speeds the Holy Index of Refraction and he shall writeth it down as I have given it to you, using the humble small letter n and he shall separate the n of the heavens from the n of the materials possessing the properties I have outlined by calling them n1 and n2. The Holy Convention shall dictate that n1 is to the left and n2 to the right so that all shall proceed with their calculations in the same manner. Thus it shall be for all time, yea, even relativistic." Thus the angel went down to the earth and did as he/she/it had been instructed by the Lord and it came to pass that Snell, being a faithful and obedient servant of the Lord, did precisely as he had been instructed. The Lord saw that this was good and named he/she/it the results of the law refraction and the people of the earth accepted his/her/its law in all its various forms, yea, even the simpleminded thin lens formula, and rejoiced in the name of the Lord and the word refraction was on the lips of every student who had the great privelege of graduating from high school.