Answer:
Here's your answer :
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1
Explanation:
Because theyre heading opposite directions
No, it's not there.
For a machine to be 100% efficient, it has to be with an output which is equal to its input. But machines have an out put less than an input, hence efficiency below 100%.
I think C......................
1.171
if n₁sinΘ₁=n₂sinΘ₂, then n₂=n₁sinΘ₁ / sinΘ₂;
