Fix the errors in the Fresnel example notebook
Fix the errors in the Fresnel example notebook

oliverlee/sympy,Titan-C/sympy,kmacinnis/sympy,sampadsaha5/sympy,ga7g08/sympy,ahhda/sympy,jamesblunt/sympy,amitjamadagni/sympy,kevalds51/sympy,sahilshekhawat/sympy,oliverlee/sympy,hargup/sympy,MechCoder/sympy,madan96/sympy,kmacinnis/sympy,jerli/sympy,souravsingh/sympy,saurabhjn76/sympy,cswiercz/sympy,Sumith1896/sympy,mafiya69/sympy,saurabhjn76/sympy,souravsingh/sympy,kaushik94/sympy,Davidjohnwilson/sympy,MridulS/sympy,kevalds51/sympy,Titan-C/sympy,drufat/sympy,shikil/sympy,lidavidm/sympy,iamutkarshtiwari/sympy,hargup/sympy,skirpichev/omg,Shaswat27/sympy,vipulroxx/sympy,atsao72/sympy,VaibhavAgarwalVA/sympy,shipci/sympy,yashsharan/sympy,Curious72/sympy,skidzo/sympy,jaimahajan1997/sympy,jamesblunt/sympy,sahilshekhawat/sympy,abhiii5459/sympy,atreyv/sympy,ahhda/sympy,farhaanbukhsh/sympy,beni55/sympy,mafiya69/sympy,Shaswat27/sympy,Sumith1896/sympy,oliverlee/sympy,AkademieOlympia/sympy,abhiii5459/sympy,postvakje/sympy,chaffra/sympy,drufat/sympy,Davidjohnwilson/sympy,lindsayad/sympy,jamesblunt/sympy,Gadal/sympy,Arafatk/sympy,mafiya69/sympy,debugger22/sympy,pandeyadarsh/sympy,maniteja123/sympy,meghana1995/sympy,Arafatk/sympy,cswiercz/sympy,ga7g08/sympy,kumarkrishna/sympy,Arafatk/sympy,toolforger/sympy,kaushik94/sympy,pandeyadarsh/sympy,AunShiLord/sympy,ga7g08/sympy,ChristinaZografou/sympy,vipulroxx/sympy,kumarkrishna/sympy,liangjiaxing/sympy,toolforger/sympy,vipulroxx/sympy,cccfran/sympy,Mitchkoens/sympy,MechCoder/sympy,shipci/sympy,atsao72/sympy,moble/sympy,maniteja123/sympy,ChristinaZografou/sympy,AkademieOlympia/sympy,mcdaniel67/sympy,Sumith1896/sympy,aktech/sympy,AunShiLord/sympy,jaimahajan1997/sympy,grevutiu-gabriel/sympy,abloomston/sympy,wyom/sympy,sampadsaha5/sympy,dqnykamp/sympy,atreyv/sympy,souravsingh/sympy,yukoba/sympy,Curious72/sympy,Gadal/sympy,madan96/sympy,cccfran/sympy,shipci/sympy,yukoba/sympy,sahmed95/sympy,jerli/sympy,beni55/sympy,Davidjohnwilson/sympy,drufat/sympy,kaichogami/sympy,emon10005/sympy,lidavidm/sympy,garvitr/sympy,Designist/sympy,kevalds51/sympy,mcdaniel67/sympy,iamutkarshtiwari/sympy,yashsharan/sympy,dqnykamp/sympy,lindsayad/sympy,chaffra/sympy,Designist/sympy,pbrady/sympy,cswiercz/sympy,rahuldan/sympy,wanglongqi/sympy,kaushik94/sympy,pbrady/sympy,Vishluck/sympy,abloomston/sympy,asm666/sympy,Mitchkoens/sympy,asm666/sympy,sunny94/temp,liangjiaxing/sympy,shikil/sympy,kumarkrishna/sympy,AkademieOlympia/sympy,MridulS/sympy,pandeyadarsh/sympy,lidavidm/sympy,asm666/sympy,meghana1995/sympy,toolforger/sympy,Vishluck/sympy,hargup/sympy,dqnykamp/sympy,abloomston/sympy,jerli/sympy,aktech/sympy,beni55/sympy,Gadal/sympy,wyom/sympy,yashsharan/sympy,grevutiu-gabriel/sympy,emon10005/sympy,kaichogami/sympy,Designist/sympy,atreyv/sympy,saurabhjn76/sympy,Curious72/sympy,kmacinnis/sympy,ahhda/sympy,yukoba/sympy,wanglongqi/sympy,atsao72/sympy,sunny94/temp,moble/sympy,amitjamadagni/sympy,maniteja123/sympy,hrashk/sympy,Mitchkoens/sympy,VaibhavAgarwalVA/sympy,bukzor/sympy,mcdaniel67/sympy,hrashk/sympy,iamutkarshtiwari/sympy,diofant/diofant,rahuldan/sympy,garvitr/sympy,aktech/sympy,garvitr/sympy,emon10005/sympy,grevutiu-gabriel/sympy,postvakje/sympy,abhiii5459/sympy,farhaanbukhsh/sympy,rahuldan/sympy,kaichogami/sympy,sunny94/temp,Vishluck/sympy,sahmed95/sympy,meghana1995/sympy,pbrady/sympy,hrashk/sympy,debugger22/sympy,AunShiLord/sympy,postvakje/sympy,ChristinaZografou/sympy,skidzo/sympy,bukzor/sympy,chaffra/sympy,debugger22/sympy,farhaanbukhsh/sympy,VaibhavAgarwalVA/sympy,jbbskinny/sympy,sahmed95/sympy,sahilshekhawat/sympy,MechCoder/sympy,wanglongqi/sympy,bukzor/sympy,lindsayad/sympy,liangjiaxing/sympy,wyom/sympy,jaimahajan1997/sympy,Titan-C/sympy,cccfran/sympy,jbbskinny/sympy,moble/sympy,MridulS/sympy,skidzo/sympy,shikil/sympy,sampadsaha5/sympy,Shaswat27/sympy,madan96/sympy,jbbskinny/sympy