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In a glass slab, a ray of light is refracted twice. The emergent ray is:
APerpendicular to the incident ray
BParallel to the incident ray but laterally displaced
CAlong the same line as the incident ray (option)
DReflected back to the source
Answer & Solution
Correct answer: B. Parallel to the incident ray but laterally displaced
1. At the first surface the ray bends towards the normal.
2. At the second parallel surface it bends away from the normal by the same angle.
3. The emergent ray is therefore parallel to the incident ray with a lateral shift.
_Source: NCERT Class 10 Science, Ch 9 "Light Reflection and Refraction", §9.3.1_
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