During refraction of light through the glass slab incidents ray and emergent ray are parallel to each other
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Yes, incident ray and emergent ray are parallel to each other.
Light rays are reversible. They travel exactly the same path if they are going in the opposite direction. So if light is refracted some angle going from lighter medium to denser medium, it would refract exactly the same angle in the opposite direction going from glass to air.
Light rays are reversible. They travel exactly the same path if they are going in the opposite direction. So if light is refracted some angle going from lighter medium to denser medium, it would refract exactly the same angle in the opposite direction going from glass to air.
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