Light and Sound

Light and Sound

1. Light

   • Light travels in a straight line and is usually in waves they also carry energy.
   • Direct light travels straight from the object o the eye
   • in reflection there is a angle of incidence and a reflected angle
   • the angle of incidence should match the angle of reflection
     • when light goes from a less dense medium to a more dense medium it bends away from he normal
   • lenses- A concave lens spreads out the light and the convex less focuses the light rays
   • when white light passes through a prism it creates a spectrum of the colours that make up white light

2. in a ray diagrams with reflection you use a dotted line for the normal and that is where the mirror is.

3. sound:

   • A sound wave is made up of a trough, a peak.
   • the wavelength is measured from peak to peak or trough to trough
   • the amplitude is measured from the normal to the edge of the peak
   • The Frequency is how many waves pass a specific point in one second
   • Measured in hertz