Yes
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There are several definitions of "right", so I will give you antonyms for each. If you mean "right" as a direction (for example, turn right at the stop sign), the opposite would be "left". If you mean "right" as a statement of truth (for example, you have the right answer), the opposite would be "wrong". If you mean "right" as a privilege (for example, the right to freedom of speech), the opposite would be "prohibition".
Because we can't see the image you're referring to, we can't give the answer to which ray is opposite to BA. However, we can help. Opposite rays are two rays that both start from a common point and go off in exactly opposite directions. So, if there are two rays (BA and BC) with a common endpoint (B) going in different directions, they are called opposite rays.