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→Concept #3 - Particle Nature of Light
#When particles enter a surface, what do you expect to see? (They slow down, change direction, etc)
#When particles enter a surface, what do you expect to see? (They slow down, change direction, etc)
#Can you visualize reflection and refraction as particles?
#Can you visualize reflection and refraction as particles?
#If in a dark room there is a single bulb on the wall and we put a partition in front of the light, will the room be completely dark behind the partition?
#What happens in the light bulb case? How is the light getting spread in the room? Can light (travelling in a straight line) bend around the partition?
#If you imagine waves of light, how would you explain this (think of waves of water)?
#Now what is your conclusion about the theory of light?
* '''Evaluation (Questions for assessment of the child)'''
#Can you draw a ray diagram for reflection and refraction of light for particles and waves?
#Based on the evidence so far - reflection and refraction, which theory of light better explains the behaviour of light
#Based on the evidence so far - reflection and refraction, which theory of light better explains the behaviour of light
* '''Question Corner'''
===Activity No # 4 - Particle vs wave ===
{| style="height:10px; float:right; align:center;"
|<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;">
''[http://karnatakaeducation.org.in/?q=node/305 Click to Comment]''</div>
|}
Overwhelmingly evidence was in favour of light as a wave until a discovery was made that light could make metals emit electrons. Click [http://karnatakaeducation.org.in/KOER/en/index.php/Photoelectric_Effect_and_LASER here] to see about photoelectric effect.
* '''Estimated Time''' - 45 minutes
* '''Materials/ Resources needed'''
Computer, projector, power
* '''Prerequisites/Instructions, if any'''
Students must have done simple optics experiments on reflection and refraction.
* '''Multimedia resources'''
* '''Website interactives/ links/ simulations'''
[[File:particle_reflection.png|300px|link=http://www.olympusmicro.com/primer/java/particleorwave/refraction/index.html]]
[[File:particle_wave_reflection.png|300px|link=http://www.olympusmicro.com/primer/java/particleorwave/reflection/index.html]]
* '''Process (How to do the activity)'''
#Demonstrate the tutorial and discuss the following questions 1-5
#Show the diffraction tutorial and discuss the other questions
* '''Developmental Questions (What discussion questions)'''
#When particles hit a surface, what do you expect to see? (Bounce, reflection)
#When particles enter a surface, what do you expect to see? (They slow down, change direction, etc)
#Can you visualize reflection and refraction as particles?
#If in a dark room there is a single bulb on the wall and we put a partition in front of the light, will the room be completely dark behind the partition?
#If in a dark room there is a single bulb on the wall and we put a partition in front of the light, will the room be completely dark behind the partition?
#What happens in the light bulb case? How is the light getting spread in the room? Can light (travelling in a straight line) bend around the partition?
#What happens in the light bulb case? How is the light getting spread in the room? Can light (travelling in a straight line) bend around the partition?
#If you imagine waves of light, how would you explain this (think of waves of water)?
#If you imagine waves of light, how would you explain this (think of waves of water)?
#Now what is your conclusion about the theory of light?
#Now what is your conclusion about the theory of light?
* '''Evaluation (Questions for assessment of the child)'''
* '''Evaluation (Questions for assessment of the child)'''
#Can you draw a ray diagram for reflection and refraction of light for particles and waves?
#Based on the evidence so far - reflection and refraction, which theory of light better explains the behaviour of light
* '''Question Corner'''
* '''Question Corner'''
Click [http://karnatakaeducation.org.in/KOER/en/index.php/Light_as_energy here] for more notes on the nature of light, visible light and colours.
Click [http://karnatakaeducation.org.in/KOER/en/index.php/Light_as_energy here] for more notes on the nature of light, visible light and colours.
==Concept # 3- Dual Nature of Light==
==Concept # 3- Dual Nature of Light==