Needs New Photo

O1-01: EYE MODEL - OPTICS
O1-21: CHROMATIC ABERRATION IN EYE
O2-02: ZOETROPE AND PRAXINOSCOPE
O2-14: VISUAL LATENCY - REACTION TIME
O3-01: COLOR PERCEPTION IN SHADOWS - SLIDE PROJECTORS
O3-02: COLOR PERCEPTION IN SHADOWS - DOUBLE POINT SOURCE
P2-01: PHOTOELECTRIC EFFECT AND PLANCK'S CONSTANT
P2-11: INTERFERENCE OF PHOTONS
P2-15: WAVE PACKETS - OSCILLATORS
P3-11: LANGMUIR EXPERIMENT
P3-24: CATHODE RAY TUBES - MISCELLANEOUS
P3-41: FRANCK-HERTZ EXPERIMENT
P3-54: ENERGY LEVELS - BALLS AND LADDER
P3-66: FLUORESENCE AT LN TEMPERATURE
P4-03: RADON DETECTION
P4-04: COSMIC RAYS
P4-51: MILLIKAN OIL DROP MODEL
Q1-01: Spinal Expansion Model
Q1-12: Arm Model
Q2-01: Heart Model

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