Principle

This experiment is suitable as both an introductory experiment
and as a confirmation experiment for the validity of the inverse
square law. In connection with the measurements of the side lengths
of the illuminated areas the students must use their knowledge of
umbra and penumbra. Since the light source is not a point, the
marginal shadows are not sharply defined.

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 is the correlation between the illumination and the
distance from the light source to the illuminated area? Investigate
how the illumination E is correlated with the separation r by
changing the distance between a light source and an illuminated
area.