Define angle of emergence and angle of refraction.
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The angle of emergence is the angle of the light coming out of a medium (for an example a glass slab with parallel sides). The first medium could be air and the medium in the middle could be water or a glass slab with parallel sides. The ray of light travels down at an angle through the air and enters the glass.
The angle between a refracted ray and the normal drawn at the point of incidence to the interface at which refraction occurs.
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The light refracts or bends as it enters the glass, then carries on and emerges at a new angle back into the air. The ray of light coming out is parallel to the incident ray and the angle of emergence is the same as the angle of incidence.
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