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a
The emergent rays of all the colours are parallel to the incident ray.
b
Yellow (mean) coloured ray is parallel to the incident ray
c
Only red coloured ray is parallel to the incident ray
d
All the rays are parallel, but not parallel to the incident ray.
answer is B.
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Detailed Solution
In case of dispersion without deviation, the mean deviation is 0. So the light only disperses. As the mean deviation is zero, the emergent yellow ray is parallel to the incident ray.