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L6-55. Fresnel Flashlight

Purpose

To show an application of the Fresnel lens.

Equipment

Fresnel and normal flashlights.

Images

l6-55

Description

A "Fresnel flashlight" has a Fresnel lens covering the central area of the glass, causing light which would normally spread out over a large cone to be focused into a nearly parallel beam. Unfortunately, when you compare the light output of this Fresnel flashlight with that of a normal flashlight it really doesn't seem brighter. But it's a nice idea for peddling flashlights.