In your laboratory, you trace the path of light rays through a glass slab for different values of angle of incidence (∠i) and in each case, measure the values of the corresponding angle of refraction (∠r) and angle of emergence (∠e). Based on your observations, the correct conclusion is

Since the light ray enters from a rarer (air) medium to a denser (glass) medium, the ray bends toward normal. As a result, the angle of incidence (angle between the incident ray and normal) ∠i is more than the angle of refraction (angle between refracted ray and normal ) ∠r.
Let n2 be the refractive index of denser medium (glass slab).
Let n1 be the refractive index of rarer medium (air).
Now using Snell's law, when the light ray goes into glass from the air,
n2/n1 = sin i / sin r.. (1),
When the light ray goes into the air from glass,
n1/n2 = sin r / sin e
or n2/n1 = sin e / sin r (2)
Using (1) and (2), we get , sin i / sin r = sin e / sin r, sin i = sin e or ∠i = ∠e
Thus, ∠i is more than ∠r, but nearly equal to ∠e.