Light

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  • Light
    • Reflection
      • Laws
        • The incident ray, the reflected ray and the normal to the surface all lie in the same plane.
        • The angle of incidence is equal to the angle of reflection.
      • Types
        • Regular
          • light reflected in 1 direction
          • occ on smooth surfaces
          • clear images formed
        • Diffused
          • No clear image
    • Images in a plane mirror
      • same size as the obj
      • Laterally inverted
      • upright
      • virtual
      • @ a position as far behind the mirror as obj is in front of mirror
    • Other mirrors
      • Convex
        • provides wider field of vision
        • images small, distorted
        • uses
          • placed ard road bends
          • in stores
        • ie surface curves outwards
      • Concave
        • magnify images
        • ie surface curves inwards
    • Refraction
      • Definition
        • Bending of light as it enters a different medium at an angle
          • occurs due to change in speeds of light in the two media.
            • Speed of light < as it travels through a denser medium.
              • rarer --> denser medium
                • bends towards normal
              • optically denser material is one that bends light more
          • How?
            • rarer --> denser medium
              • bends towards normal
            • denser --> rarer medium
              • bends away fr normal
      • Examples
        • Glass blocks
        • Swimming pool
          • Real and apparent depth
      • Dispersion
        • ie splitting of light into spectrum of its component colours
          • White liight is m/u of 7 colours (roygbiv, in order of longest to shortest wavelength)
            • violet -- travels slowest, so refracted most
            • red -- travels fastest, so refracted least
          • How?

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