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Colour n lenses
- 2. ColourColour White light is not a single colour; it is made up of a mixture of the seven colours of the rainbow. We can demonstrate this by splitting white light with a prism: This is how rainbows are formed: sunlight is “split up” by raindrops.
- 3. The colours of the rainbow:The colours of the rainbow: Red Orange Yellow Green Blue Indigo Violet
- 4. Adding coloursAdding colours White light can be split up to make separate colours. These colours can be added together again. The primary colours of light are red, blue and green: Adding blue and red makes magenta (purple) Adding blue and green makes cyan (light blue) Adding all three makes white again Adding red and green makes yellow
- 5. Seeing colourSeeing colour The colour an object appears depends on the colours of light it reflects. For example, a red book only reflects red light: White light Only red light is reflected
- 6. A white hat would reflect all seven colours: A pair of purple trousers would reflect purple light (and red and blue, as purple is made up of red and blue): Purple light White light
- 7. Using coloured lightUsing coloured light If we look at a coloured object in coloured light we see something different. For example, consider a football kit: White light Shorts look blue Shirt looks red
- 8. In different colours of light this kit would look different: Red light Shirt looks red Shorts look black Blue light Shirt looks black Shorts look blue
- 9. Some further examples: Object Colour of light Colour object seems to be Red socks Red Red Blue Black Green Black Blue teddy Red Black Blue Green Green camel Red Blue Green Magenta book Red Blue Green
- 10. Using filtersUsing filters Filters can be used to “block” out different colours of light: Red Filter Magenta Filter
- 11. Investigating filtersInvestigating filters Colour of filter Colours that could be “seen” Red Green Blue Cyan Magenta Yellow
- 15. Concave and Convex LensesConcave and Convex Lenses Look at the convex and concave lenses below:
- 16. The curved surface/surfaces of a lens bends the light. Notice the paths of light of the convex and concave lenses shown below.
- 17. Convex LensesConvex Lenses A convex lens is thicker in the middle. A convex lens bends light rays so that they meet at a focal point. This means that the Light rays are converging.
- 18. Concave LensConcave Lens A concave lens is thinner in the middle. A concave lens bends light rays to make them spread out. This means that the light rays are diverging.
- 19. Corrective LensesCorrective Lenses The Eye (pg. 229)
- 20. Vision
- 21. Near-sighted VisionNear-sighted Vision • See objects up close but not at a distance. • Concave lenses are used to correct this vision.
- 23. Far-sighted VisionFar-sighted Vision • See objects at a distance but not up close. • Convex lenses are used to correct this vision.