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In a glass slab, a ray of light is refracted twice. The emergent ray is:
Answer & Solution
Correct answer: B.
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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