Question

A light wave is shone on a glass block at the boundary between air and glass which wave phenomena can been demonstrated

Answer 1

At the boundary between air and glass, we can see mainly refraction ...
the path of the light bends as it crosses the boundary, and proceeds
from there in a different direction.

If we're very careful and make sensitive measurements, then we can also
detect transmission, some reflection, and a tiny bit of dispersion at the boundary.

Answer 2

Reflection and Refraction

Step-by-step explanation:

There are four wave phenomenon that can be observed while studying any wave: reflection, refraction, dispersion, and interference. This depends on the medium of interaction among other factors.

Here two of the wave phenomenon can be observed, namely:

1. Refraction: The phenomenon of bending of light when it passes from one medium to another. So when the light will travel from air to glass, it will divert from its path and bend a little towards the normal. (Normal is an imaginary line drawn perpendicular to the boundary between two mediums)

2. Reflection: Some part of the light will be reflected back from the boundary. It depends on how transparent the glass block is. If it is 100% transparent (which is very nearly impossible to make) there will be no reflection.