A ray of light is incident on a glass slab at angle i. The emergent ray is:
A. Parallel to incident ray but laterally displaced
B. Bent away from the normal
C. Perpendicular to incident ray
D. Bent towards the normal
Answer: Option A
Solution (By JKSSB Mock Tests)
In a parallel-sided glass slab, refraction at first surface bends ray towards normal; at second surface (glass to air), it bends away by equal angle, making emergent ray parallel to incident ray but shifted laterally. No net deviation, only displacement. Memory aid: 'Slab: emergent ray parallel to incident; prism: emergent ray deviated'. This ray optics concept is frequently tested in competitive exams. Always distinguish slab (parallel faces) from prism (non-parallel faces) behavior: slab causes lateral shift, prism causes angular deviation.
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