A ray passes through a rectangular glass slab and emerges into air. Which statement is correct? 
AThe emergent ray is always perpendicular to the incident ray.
BThe emergent ray is parallel to the incident ray but is laterally displaced.
CThe emergent ray passes through the same line with no shift.
DThe angle of emergence is always smaller than the angle of incidence in air.
Answer & Solution
Correct answer: B. The emergent ray is parallel to the incident ray but is laterally displaced.
At the first face of the slab, the ray bends due to refraction; at the second parallel face, it bends back by an equal amount. Therefore the emergent ray is parallel to the incident ray, but shifted sideways, producing lateral displacement.
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