Which of the following are needed in order for light to experience refraction. ( select all that apply)
a You must go from a region with a lower index of refraction (n1) to a region with a higher index of refraction (n2). (n2 > n1)
b A simple flat surface between the two mediums
c The incident angleopen parentheses theta subscript 1 close parenthesesnot equal to zeroopen parentheses theta subscript 1 not equal to 0 close parentheses
d Different mediums