Fresnel Spotlight

Purpose

To illustrate how Fresnel lenses are used in theatre spotlights.

Equipment

Fresnel spotlight on rolling stand.

Suggestions

This rolling spotlight is also useful in lighting demonstrations for TV.

Images

l6-56

Description

The lens of this spotlight has a very short focal length, yet is quite thin and light because it is a Fresnel lens. The bulb in the spotlight can be moved along the optic axis to change the size of the area lit by the spotlight.