LIGHT

LIGHT

1. Radiation

   • Radiation is energy that  comes from a source and  Travels through some material or through space. Light, heat  and sound are types of radiation. Light is a type of electromagnetic radiation.
   • Electromagnetic waves
     • Can travel through a vacuum at a speed of 300 000 km/s: this is "the speed of light in a vacuum" and is represented by the letter c. c = 300 000 km/s Light is the visible radiation of the electromagnetic spectrum.
     • Wave energy
       • Wave energy is proportional to wave frecuency, so the higher the frecuency of wave is, the more energy the wave has. The frequency of a wave refers to how often the particles of the medium vibrate when a wave passes through the medium.

2. PROPERTIES

   • Three properties: a) It travels in a straight line. b) It is reflected when it meets a reflective surface. c) It changes direction when it moves from one medium to another (it's refracted)
   • Travels in straight line
     • Produce shadows & penumbras
     • Eclipses
   • Is reflected:
     • Images formation
       • In a plane mirror
       • In curved mirror
     • Laws
   • Is refracted
     • Laws
     • Light dispersion
     • Lens
       • Images through lenses
         • Convergent Biconvex
         • Divergent Biconcave

3. LIGHT & COLOURS

   • Transparency Opacity Translucency
   • Addictive and subtractive colours

4. THE EYE AND SIGHT

   • Anatomy
   • Eye defects
     • Myopia Hyperopia Astigmatism