Question

can u answer this (b)

Answer 1

1. Vacuum
Solution: 
We know,
Vacuum = Media B × Speed of light into medium B
              = 1.5 × 2*10⁸ m/s
              = 3.0 × 10⁸ m/s
2. Medium 'A'
Sol..
We know,
Medium 'A' = speed of vacuum
                            media A
                   = 3.0 × 10⁸ 
                          2.0
                   = 1.5 × 10⁸ m/s