DEMO-TEACHING Properties of Light for grades 7

SCIENCE 7

1. WELCOME TO SCIENCE CLASS

2. RECAP

3. Wave Theory of Light Corpuscular Theory of Light Two classification of common sources of light.

4. GIBBERISH CHALLENGE

5. LITE THROW BOWL IN EAST TRAIT LINE LIGHT TRAVELS IN STRAIGHT LINE

6. EAST PED OFF LITE SPEED OF LIGHT

7. REEF FLEAK SHOWN REFLECTION

8. RIFF ROCK SHOWN REFRACTION

9. DEAF RACK SHOWN DIFFRACTION

10. THIS PAIR SHOWN DISPERSION

11. EY FAKES OFF MATTER ALS OWN LITE EFFECTS OF MATERIALS ON LIGHT

12. Properties of Light

13. Learning Objectives: At the end of a 60-minute lesson, 80% of the learners must be able to : a . identify the properties of light, b. explain that light travels a very high speeds in straight lines, and c. recognize that white light can be separated into the colors of the visible spectrum using a prism.

14. 7 basic properties of light : Light travels in straight line. Speed of light. Reflection of light. Refraction of light. Diffraction of light. Dispersion of light. Effects of materials on light.

15. Light travels in straight line . The reason light travels in straight lines are because it is an   electromagnetic wave, and all waves travel in straight lines.

16. Speed of light . The exact value of the speed of light is 3x 10^8 m/s in a vacuum.  

17. Reflection of light . Reflection is the process of bouncing back light rays when it strikes the smooth and shiny reflecting surface.

18. Refraction of light . Refraction is when light rays travelling in a medium are incident on a transparent surface of another medium there will be a change in direction as it travel in second medium.

19. Diffraction of light . D iffraction is the spreading of light or waves around obstacles.

20. Dispersion of light . Dispersion is the splitting of white light into seven constituent colours when passed through the prism.

21. Effects of materials on light. . Effects of Materials on Light can be classified into three based on how it responds to light incident on them: transparent, translucent and opaque.

22. Transparent It allows light to easily pass through them.

23. Translucent It allow light to pass through but distorts the light during the passage .

24. Opaque It absorb light; do not let light to pass through.

25. Generalization What are the properties of light? What are the colors produced when white light enters a prism? What are the three classifications on the Effects of Materials based on how it responds to light incident on them?

26. QUIZ TIME!

27. Assignment Bring illustration board, scissor and glue or paste for tomorrow’s activity, “My Spectrum Wheel”.

28. References https ://www.bing.com/videos/search?q=PROPERTIES+OF+LIGHT+ll+PHYSICS+-+Bing+video&qpvt=PROPERTIES+OF+LIGHT+ll+PHYSICS+-+Bing+video&view=detail&mid=9B554D015C63461D7B189B554D015C63461D7B18&& FORM=VRDGAR Science 7 Learner’s Material – Unit 3-Module 4: LIGHT

29. Thank You!