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(Wavelength (Rest position=No wave., Amplitude=Height or depth of the wave…
Electromagnetic Spectrum
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Visible light (red, orange, yellow, green, blue, violet)
Wavelength
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Amplitude=Height or depth of the wave from rest to the crest, or from rest to the trough of the wave.
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Umbra and Penumbra 
Pinhole Camera
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Laws of Reflection
The incident ray, normal and reflected ray all lie on the same plane.
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Drawing Images in a Plane Mirror
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Drawing Ray Diagrams
Refraction of light
Index of refraction formula
Snell's Law
Thin Lens Equation