MCQ
Three right angled prisms of refractive indices $n _1, n _2$ and $n _3$ are fixed together using an optical glue as shown in figure. If a ray passes through the prisms without suffering any deviation, then
- A$n _1= n _2= n _3$
- B$n _1= n _2 \neq n _3$
- C$1+ n _1= n _2+ n _3$
- ✓$1+ n _2^2= n _1^2+ n _3^2$
