Technically you can go forever on and on, but maybe your question was like how many rotations in a certain distance?
answer: in pic
explanation: found it here http://gaaq.weebly.com/uploads/7/8/8/4/78844490/chapter_11_q_as.pdf
do u know the answer to this question yet
That n2 = 2*n1. That is, the index of refraction is twice as big in medium 2 since v=c/n
High density because it is obvious it will be hard to rip and tear.