The ray diagram could be correct 1. If n1=n2=n3 2. If n1=n2 and n1ng 4. Under no circumstances The ray diagram could be correct 1. If n1=n2=n3 2. If n1=n2 and n1ng 4. Under no circumstances November 17, 2020 Category: Cengage NEET by C.P Singh , Chapter 18 - Refraction at Spherical Surfaces , Part [...]