# Geometrical Optics

## N3-24: FILTERGRAPH

Category: N3 Color
Purpose: Show colors with their spectra.

## N3-23: COLOR PERCEPTION WITH DYES AND FILTERS

Category: N3 Color
Purpose: Compare colors and spectra of dyes and filters.

## N3-22: SUBTRACTIVE FILTERS AND THEIR SPECTRA

Category: N3 Color
Purpose: Compare colors and spectra of negative filters.

## N3-21: ADDITIVE FILTERS AND THEIR SPECTRA

Category: N3 Color
Purpose: Show colors of additive filters along with their spectra.

## L4-04: REFRACTION - CAN IN WATER TANK

Category: L4 Refraction
Purpose: Illustrate refraction

## L4-42: MICROWAVES - INDEX OF REFRACTION

Category: L4 Refraction
Purpose: Determine the index of refraction of paraffin for microwaves.

## L4-41: MICROWAVES - REFRACTION BY PRISM

Category: L4 Refraction
Purpose: Demonstrate refraction of microwaves by a paraffin prism.

## L4-21: SNELL'S LAW - IMAGE DISTORTION

Category: L4 Refraction
Purpose: To illustrate a paradox involving Snell's law.

## L4-05: REFRACTION IN FISH TANK - PORTABLE

Category: L4 Refraction
Purpose: To illustrate refraction.

## L3-41: ANAMORPHIC ART

Category: L3 Curved Mirrors
Purpose: Demonstrate a type of anamorphic art.

## L3-33: VANITY MIRROR

Category: L3 Curved Mirrors
Purpose: Show the image produced by a cocave mirror.

## L3-32: CYLINDRICAL MIRROR DEMONSTRATOR

Category: L3 Curved Mirrors
Purpose: Demonstration of cylindrical concave and convex mirrors.

## L3-26: PENDULUM AND SPHERICAL MIRROR

Category: L3 Curved Mirrors
Purpose: Optical illusion using concave mirror.

## L3-25: IMAGE LOCATION WITH TV CAMERA - CONCAVE MIRROR

Category: L3 Curved Mirrors
Purpose: Locate the image position for a concave mirror.

## L3-24: OPTICAL BOARD - SPHERICAL AND PARABOLIC MIRRORS

Category: L3 Curved Mirrors
Purpose: Demonstrate the difference in spherical aberration between concave spherical and parabolic mirrors.

## B4-21: DEFLECTION OF BEAM - OPTICAL LEVER

Category: B4 Elasticity
Purpose: Demonstrate the small deflection of an aluminum beam due to weighting between supports.

## L3-23: IMAGE ON SCREEN USING CONCAVE MIRROR

Category: L3 Curved Mirrors
Purpose: Show an image produced by a concave mirror.

## l3-22: MIRAGE

Category: L3 Curved Mirrors
Purpose: Demonstrate an optical illusion using concave mirrors.

## L3-20: APPARENT REFLECTION FROM REAL IMAGE

Category: L3 Curved Mirrors
Purpose: Illusion of laser beam reflecting off an image!

## L3-18: FOCUSING OF HEAT WAVES - OVERHEAD PROJECTOR

Category: L3 Curved Mirrors
Purpose: Illustrate focusing of heat in a very dramatic way.
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• #### H2-01: FOCUSING OF SOUND WITH CONCAVE REFLECTORS

Demonstrate how sound waves can be focused by concave reflectors. Read More
• #### H2-02: PARABOLIC MICROPHONE

Show what a parabolic microphone is and to demonstrate its sensitivity individually. Read More

• #### H2-11: SOUND LENS

Demonstrate focusing of sound by refraction in a sound lens Read More
• #### H2-21 AUDIBLE YOUNG'S EXPERIMENT - GROUP LISTENING

Demonstrates interference of sound waves with two coherent sources Read More
• #### H2-22: INTERFERENCE - TRANSPARENCIES

An optical analog to the interference pattern from two identical sound sources. Read More
• #### H2-24: AUDIBLE YOUNG'S EXPERIMENT - MIC AND SCOPE

Demonstrate interference of sound with two coherent sound sources in a quantitative way. Read More
• #### H2-25: QUINCKE'S INTERFERENCE TUBES

Demonstrate interference of sound waves in a perhaps surprising way. Read More
• #### H2-26: PHASE REVERSAL BETWEEN STEREO SPEAKERS - MUSIC

Demonstrate interference of sound in a dramatic way. Read More
• #### H2-27: PHASE REVERSAL BETWEEN STEREO SPEAKERS - OSCILLATOR

Dramatically demonstrate interference between two identical sources. Read More
• #### H2-28: FOURIER SYNTHESIZER - ADDITION OF WAVES

Demonstrate addition of two sine waves with variable phase difference. Read More
• #### H2-31: ACOUSTIC COLLIMATOR

Demonstrate the effect of frequency on diffraction of sound. Read More
• #### H2-32: SPEAKER WITH BAFFLE

Demonstrates diffraction and interference of sound waves Read More
• #### H2-33: SPEAKER AND EXPONENTIAL HORN

Demonstrate the effect of an exponential horn enclosure. Read More

• #### H2-51 BEATS - AUDIO OSCILLATORS, SPEAKER & OSCILLOSCOPE

Hear audio beats and see their wave forms on an oscilloscope Read More
• #### H2-52: BEATS AND RESONANCE - TUNING BARS

Demonstrate beats, and to demonstrate resonance between two identical tuning bar resonators. Read More