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Light (Definition of Light (Light travels in straight lines., Natural…

- - - - Incident rays, reflected rays lies at the same plane
      - Angle of incidence = Angle of reflection
    - - Regular reflection
        
        Occurs at smooth surfaces.(eg mirrors)
        
        Parallel rays are reflected in same directions as the surface are even.
        
        All points of incidence are parallel to one another.
      - Diffuse reflection
        
        Occurs at rough surfaces.(eg. Sandpaper, Cloth)
        
        All points of incidents are not parallel to one another
        
        Parallel rays are reflected in different directions as the surface are uneven.
- - - - Emission of light due to chemical reaction.
      - Emits little heat.
    - - Production and emission of light by a living organism.
      - Occurs widely in marine vertebrates and invertebrates, as well as in some fungi, microorganisms like fireflies.