Monday, 23 June 2014 16:21
L6-55: FRESNEL FLASHLIGHT
Additional Info
- ID Code: L6-55
- Purpose: Show an application of the Fresnel lens.
- 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.
- Availability: Available
- References: REFERENCES: (PIRA unknown.)
Published in
L6 Lenses
Tagged under
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L6-01: OPTICAL BOARD - CONVERGING SPHERICAL LENS
Show focusing of a spherical (cylindrical) convex lens Read More
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L6-02: OPTICAL BOARD - CIRCULAR SLAB
Show focusing of a circular lens Read More
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L6-03: OPTICAL BOARD - HYPERBOLIC LENS
Show focusing of a hyperbolic lens Read More
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L6-04: OPTICAL BOARD - RAY DIAGRAM - REAL IMAGE POS LENS
Use principal rays to locate a real image produced by a convex lens Read More
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L6-05: OPTICAL BOARD - RAY DIAGRAM - VIRTUAL IMAGE POS LENS
Demonstrate that a lens focuses light Read More
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L6-06: MULTIPLE PINHOLES AND LENS RECOMBINATION
Demonstrate that a lens focuses light Read More
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L6-07: MICROWAVES - LENS
Demonstrate that a paraffin lens can focus microwaves Read More
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L6-08: REAL IMAGE OF CONVERGING LENS - LIGHT BULB
Show the real image of a converging lens Read More
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L6-09: REAL IMAGE OF CONVERGING LENS
Show the systematics of real image formation by a converging lens Read More
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L6-10: IMAGE LOCATION WITH TV CAMERA - LENS
Locate both real and virtual images of a convex lens Read More
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L6-11: OPTICAL BOARD - DEPTH OF FIELD
Illustrate the idea of depth of field of a (camera) lens, and to locate the near and far points Read More
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L6-12 MAGNIFYING LENS IN WATER
Shows that focal properties of a lens depend on the medium in which the lens is located Read More
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L6-13: OPTICAL BOARD - PARALLEL RAY FOCUS
Demonstrate focusing of parallel rays in a counterintuitive way Read More
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L6-14: IMAGE OF CONVEX LENS - WITH AND WITHOUT BAFFLE
Encourage thought regarding how an image is formed Read More
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L6-21: OPTICAL BOARD - DIVERGING SPHERICAL LENS
Determine the focal point of a concave lens Read More
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L6-22: OPTICAL BOARD - RAY DIAGRAM - VIRTUAL IMAGE NEG LENS
Use the three principal rays to locate the virtual image of a diverging lens Read More
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L6-31: STRING MODEL - SPHERICAL ABERRATION
Illustrate light rays for spherical aberration Read More
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L6-32: OPTICAL BOARD - SPHERICAL ABERRATION IN LENS
Demonstrate spherical aberration using rays Read More
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L6-33: STRING MODEL - CHROMATIC ABERRATION
Illustrate rays for chromatic aberration Read More
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L6-34: OPTICAL BOARD - CHROMATIC ABERRATION IN LENS
Show chromatic aberration in a convex lens Read More
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L6-35: CHROMATIC ABERRATION - POINT SOURCE AND 20 CM LENS
Show the effect of chromatic aberration in a lens Read More
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L6-36: STRING MODEL - ASTIGMATISM
Illustrate rays for on-axis astigmatism Read More
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L6-37: ASTIGMATISM
Demonstrate off-axis astigmatism with a spherical lens. Read More
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L6-38: COMA
Illustrate coma Read More
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L6-39: DISTORTION - PINCUSHION AND BARREL WITH 2 IRISES
Show pincushion and barrel distortion Read More
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L6-40: DISTORTION - PINCUSHION AND BARREL
Fast and simple way to show pincushion and barrel distortion Read More
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L6-41: DISTORTED IMAGE - PINCUSHION AND BARREL
A slightly more complicated but better way to show pincushion and barrel distortion Read More
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L6-42: DISTORTION AND CORRECTION
Illustrate pincushion and barrel distortion and correction thereof Read More
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L6-43: DISTORTED PERSPECTIVE
Distortion by a simple lens Read More
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L6-51: OPTICAL BOARD - FRESNEL LENS
Demonstrate construction of a Fresnel lens Read More
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L6-52: FRESNEL LENSES - MISCELLANEOUS
To allow individual experience with plastic Fresnel lenses Read More
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L6-53: FRESNEL LENS MAGNIFIER
Demonstrate magnification by a thin plastic Fresnel lens Read More
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L6-54: OPTICALLY PROGRAMMED TRAFFIC SIGNAL - MODEL
Illustrate the optics of an optically programmed traffic signal Read More
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L6-55: FRESNEL FLASHLIGHT
Show an application of the Fresnel lens Read More
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L6-56: FRESNEL SPOTLIGHT
Illustrate how Fresnel lenses are used in theater spotlights Read More
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L6-71: OPTICAL DISC
Demonstrate a number of ray optics phenomena Read More
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L6-91: ANAMORPHIC LENS
Show application of anamorphic lenses to wide-screen movies Read More
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