2. Light

3. 2 Light is a form of energy Crookes Radiometer proves light has energy Turns in sunlight as the light heats the black side

4. 3 Shadows Light travels in a straight line. If something gets in its path the light is blocked. A shadow is formed.

5. 4 Eclipses Proves light travels in straight lines

6. 5 Light travels in straight lines

7. 6 Light on cards goes through if the cards are lined up. This also proves light travels in straight lines

8. 7 Reflection Incident ray Normal Reflected ray Angle of incidence Angle of reflection Flat Mirror Angle of incidence = Angle of reflection

9. 8 Image Here in a plane mirror an image is formed by the eye Can not appear on a screen dd

10. 9 Refraction Fisherman use a trident as light is bent at the surface The fisherman sees the fish and tries to spear it

11. 10

12. 11 Refraction through a glass block Light bends towards the normal

13. 12 Real and Apparent Depth A pool appears shallower

14. 13

15. 14 Focal Point Lenses Two types of lenses Converging LensDiverging Lens

16. 15 Dispersion Breaking up of white light into its colours

17. 16 Electromagnetic spectrum Gamma rays X-raysUltra violet Visible light Infra redMicrowavesRadio/TV Each type of radiation shown in the electromagnetic spectrum has a different wavelength and a different frequency: High frequency, short wavelength Low frequency,long wavelength γ The higher the frequency of the wave, the greater its energy. This makes X-rays dangerous and radio waves safe

18. 17 Primary and secondary colours

19. 18 UHF and VHF