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Light and the Electromagnetic Spectrum
Light as a Wave
• light is a visible form of energy
• most of the energy that surrounds us is invisible
• this energy travels in waves made of electric and magnetic fields
• called “Electromagnetic Radiation”
Light as a Wave
Electromagnetic Spectrum = the entire range of visible and invisible energy waves
Properties of Waves
wavelength
wavelength
amplitude
amplitude
Wavelengths of the Electro-Magnetic Spectrum
Wavelength and Colour
Seeing Colour
Pinhole Camera
How Light is Transmitted
Transparent:
allows light to pass through
Translucent:
allows some light to pass through
Opaque:
allows no light to pass through
Light Reflection
• The reason we see objects is because they reflect light
Smooth Surface
Rough Surface
Reflection in a Plane Mirror
Activity 4.11
How Light Reflects
A
B
Law of Reflection:
When light reflects off a surface, the angle of incidence is always equal to the angle of reflection
i = r
Looking in a mirror
Looking in a mirror
Looking in a mirror
Object distance vs. Image Distance