Light waves

• All waves can be reflected.
• A lens forms an image by refracting light.
• Rough surfaces reflect light but it is diffuse reflection
• Visible light is an electromagnetic wave. Electromagnetic waves are transverse.
• Lights move in a straight line.
• Which wave effect is being shown?


  Which wave effect is being shown?

  A) Reflection

  
• Which wave effect is being shown in the diagram?


  Refraction

  A) Refraction

  
• Wavelength is the distance between any point on one wave and the equivalent point on the next wave.
• Sections of longitudinal waves where the medium is "bunched up" is called compression.
• Frequency is the number of waves passing a point in one second
• Wavelength = wave speed / frequency
• A piece of paper scatters light waves in different directions.
• The line at right angles to a surface is called the normal line.
• Rod cells in the retina of the eye detect light and dark
• All colours except green is absorbed by a green filter.
• The visible light is the part of the electromagnetic spectrum that we can see.
• Mono means one
• chroma means colour
• monochromatic means one colour
• The colour violet in the electromagnetic spectrum has the shortest wavelenth
• Light can pass straight through transparent materials
• A translucent material, such as frosted glass allows light through it but the rays leave the glass in many different directions. They are scattered.
• We can show how light travels by drawing rays.
• The rays have arrows to show in which direction the light is travelling.