Question 3 0 out of 4 points An InGass photodetector is used in optical communications, operating at wavlength of A - 1310 am, The refractive index of InGass photodetecto Isn ? = 3.691 at A = 1310 nm. If the refractive Index for an AR coating on in GaAsa is n -1.91 . what is the minimum reflectence (R) with the AR coating? Note: Use ( 3 decimal) In your answer. Use exponential form For example: when no -3.61 at A = 1310 nm and the refractive index for an AR coating on inGbase Is n =1.85, the correct answer " 7.1098-4