Question

In reaction when a wave travels from one medium to another , it? changes speeds or stays in step or always moved in the same direction or travels in the opposite direction; which one is the answer?

Answer 1

if it is a light wave then speed changes resulting in the change of its direction.

Answer 2

If it is a sound wave then there is no change in the speed and direction .
But if it is light wave then it's speeds and direction both changes.

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