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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.
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Is Ray AB the same as Ray BA?
yes
How is naming a ray similar or naming a line?
naming a line is different from naming a ray. say for example ,if we have line AB,this is similar to line BA while ray AB is different from ray BA.
Is ray AB always the same as ray BA?
Yes, provided it is the ray. If AB is a vector then the answer is no.
What is the infinite numbers of points extening indefinitely in opposite direction?
It is the opposite ray.
Why should the ray emerging from the glass block come out parallel to the incident ray?
The ray comes out parallel to the incident ray because the ray has the opposite refraction as when it entered the block.
