When a monochromatic light ray passes through a parallel-sided glass slab from air, how does the emergent ray relate to the incident ray?

1. At the first surface the ray bends towards the normal (air to glass); at the second surface it bends away from the normal (glass to air) by an equal and opposite amount. 2. Because the slab's faces are parallel, the angle of emergence e equals the original angle of incidence i. 3. The chapter states the emergent ray is parallel to the incident ray but somewhat displaced with respect to it (lateral shift). 4. A perpendicular or retraced path would require non-parallel faces or reflection, so those are rejected. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 6 "Refraction of Light", p.83_