1. Questions Margin and Date What have you had Xrays or Gamma Rays for? When you see Rainbows and Prisms disperse white light what is happening? Date Topic Purpose….. Produce Experiment Report that explains what happens inside your head when you see something.

2. Last Lesson Gamma Rays – Nuclear radiation, light that goes through walls and buildings Dispersion – Prisms spreading out different wavelengths (Dr Argyros) –Wavelength measurer, Red is long, Blue is short. –Eye can see three colours

3. Light waves Light is Electromagnetic (EM) Waves (1000,000,000 kmph) Made by vibrating electricity Amplitude is in Volts (per meter) Radios and Mobile phones measure the Voltage of the air. BlueTooth waves are a mixture of thousands of different channels so that some always get through

4. You can tell light is Electricity waves –Mobile Phones need batteries –Microwave oven sparks foil –Lasers spark at focus –Hear the electricity during an X ray

5. RadioInfrared Visible UVX-rayGamma Ray Wavelength V R I V U X ROYGBIV.7.5.4

6. Experiment: After images Aim: To see after images Method: Student waves 2 sparlers in a ‘V’ shape at back of class room. Prediction……………. Observation…………. Explanation…………. Diagram: Draw a scale picture of your retina (20 mm circle) showing shape