Geometrical Optics; Light Rays and Reflections

[XL | t++ | ***]  inverse square law, luminosity

What it shows:  The intensity of light from a point source decreases as 1/r², where r is the distance from the source.

How it works:  For the point light source, we use a 1500 watt clear light bulb. The...

What it shows:

Hero's Principle states that light undergoing a reflection from a plane surface will follow the path of least distance. Here is a mechanical analog showing that when the angle of incidence equals the angle of reflection, the path length is...

What it shows:

The simplest method of controlling light to form an image is to use an opaque mask with a pinhole in it. Rectilinear propagation of light explains all (nearly). A video camera is substituted for the old prototypal shoe box so that an entire...

What it shows:

All of the concepts summarized by the above keywords can be clearly and quantitatively demonstrated with this piece of apparatus.

How it works:

A light source ¹ rotates around the circumference of a large white disk ² with degree graduations...

What it shows:

With an assortment of plane and curved mirrors, convex and concave lenses, parallel-sided block and prisms, the Klinger ¹ Blackboard Optics Kit© allows one to demonstrate all the classic examples in geometric optics by actual ray tracing in...