Principle

In this experiment, the students should understand the
refraction of light at a prism. At the same time, their
understanding of the refraction of light on passing from air to
glass or glass to air is strengthened. The splitting of light into
colours (colour dispersion) can also be observed in this
experiment, but should not be discussed. In the second part of the
experiment, the dependence of the angle of internal reflection in a
prism on the angle of incidence is demonstrated; an important law
which is used in refractometres for the determination of the
refractive indices for liquids and solids. The main emphasis in
this experiment, in regard to the development of experimental
skills, is the precise setting and reading of the angle and the
graphical representation of the results. This part of the
experiment is therefore substantially more demanding in relation to
the abilities and experimental skills required of the students. The
two experiments can be seen as a unit. However, each can also be
carried out as a separate experiment. For less capable students it
is suggested that only the first part of the experiment -
observation of refraction at a prism - should be offered.

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

How does light travel through a prism?


Investigate how light is refracted by a prism.


Determine the angle of total reflection δ with a prism as a
function of the angle of incidence α.