Principle

With total reflection the students become acquainted with an
important special case of the law of reflection, when light passes
from an optically denser to an optically less dense medium, which
has a special importance for technology (fibre-optic cables).
In this experiment, the students should first become familiar with
the known phenomenon of refraction when light passes from
glass to air, but their attention is to be directed to the region
within the block and thus to the increasing reflection of
light.
In an additional procedure they observe and investigate the case in
which light hits the boundary between glass and air at an
angle which is smaller than the critical angle for total
reflection.

Benefits


Multifunctional light box - All-in-one: Can be used for geometric optics on the table, colour mixing and on an optical bench

Extension with others sets at anytime, no additional light sources needed, recognition value for students



Tasks

What does the term "total reflection" mean? Investigate the
behaviour of narrow light beams when light passes from glass to air
with an angle of incidence greater than 40°.