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Per NCERT, in refraction through a RECTANGULAR GLASS SLAB, what is the relationship between the EMERGENT ray and the INCIDENT ray?
AEmergent ray is perpendicular to incident
BThe emergent ray is PARALLEL to the incident ray (with a sideways shift) — bending at the two parallel faces cancels out
CNo light emerges
DEmergent ray bends at 90°
Answer & Solution
Correct answer: B. The emergent ray is PARALLEL to the incident ray (with a sideways shift) — bending at the two parallel faces cancels out
Per NCERT §9.3.1, slab gives parallel emergent ray with lateral shift. The other options misstate.
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