A step index fibre has a relative refractive index of 0.88%. What is the critical angle at the corecladding interface ? A step index fibre has a relative refractive index of 0.88%. What is the critical angle at the corecladding interface ? October 22, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) , Facebook Messenger WhatsApp Share this:TwitterFacebook Related