Property 4: Refraction
Snell’s Law: n1 sin(?1) = n2 sin(?2)
NOTE: If n1 > n2 (v1< v2), THEN ?1 < ?2.
NOTE: All ?2 values (angles in the faster medium) between 0 & 90 degrees work fine.
NOTE: Not all values of ?1 (angles in the slower medium) work!
Example: If n1 = 1.33, n2 = 1, and ?1 = 75o, then
?2 = inv sin [n1 sin(?1) / n2] = inv sin [1.28] = ERROR