Principle

The experiment on refraction of light by a concave lens serves,
on the one hand, to strengthen the knowledge and experimental
skills gained from the experiments with convex lenses. The aim of
this experiment is to observe the path of light on passage through
a concave lens and determine the focal point and the focal length
using the already familiar procedure. On the other hand, a
significant difference from the convex lens becomes evident, as the
position of the (virtual) focal point is in front of the lens and
thus the introduction of the concept ’virtual image’ is
facilitated.

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 difference between concave and convex lenses?
Investigate the light path through a planoconcave lens
and determine the focal length.