I have attached 2 documents here. 1. Snell’s law paper that we worked in the class, You could use that as a resource for the introduction part. Second document is the word document where the introduction part needs to go. So, i just need 200-250 words for the only and only for introduction part. I need nothing else. You could get the formulas and info from the pdf doc. that I attached. I needed it by 8.00 am 4/9/2019 today. It is good amount of time for 200-250 word assignment. I will give the assignment only who could promise to complete by 8:00 am today(4/9/2019).