Question

Is angle of incidence equal to angle of emergence? [This is a refraction of light question]
If not, then what is it equal to?

Answer 1

Yes. Angle of incidence is equal to angle of emergence. But NOT always. because it light enters from arbitrary medium-x to medium-y but emerges from medium-z then questions may be raised. So, it is medium dependent.
But if you are in a hurry to get your homework done you may just write "Angle of incidence=Angle of emergence (if the ray emerges to the same medium as before)