1. Physical Science: Optics
Outcome C2 – Continued

2. Refraction and Reflection
When a ray of light, hits a surface, it will either be refracted, reflected or both will occur.
How do we know which will happen?
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Depends on the transparency of the object
Light will only reflect and not be able to refract if it is opaque

3. Refraction and reflection
What are some objects that will allow light to reflect off of, and refract through?
Think of 3 examples
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4. Reflection Light moves in straight lines
This can be demonstrated with simple experiments

5. Reflection
Incident ray – The ray of light that is coming from a light source
Normal – an imaginary line perpendicular to a surface that a ray of light reflects off of
Reflected ray – the ray of light that bounces off of a surface

6. Reflection
Will the source of light be on the right side of the normal? Or the left? Draw it in

7. Reflection
Angle of Incidence – This is the angle (can be measured) the incident ray makes with the normal
Angle of Reflection – This is the angle the reflected ray makes with the normal

8. Reflection
Where should the angles be measured from?

9. Reflection Plane mirror vs. Curved mirrors
A plane mirror, is a flat mirror. Ex: Bathroom mirrors, rear view mirror

10. Reflection A curved mirror can be any of two types:
Concave mirrors – Have a reflecting surface that curves inward. Imagine the inside of a bowl
Ex: Spoons, satellite dishes, flashlights

11. Reflection
Convex mirrors – Have a reflecting surface that curves outward. Imagine the outside of a bowl
Ex: Safety mirrors on trucks and busses, side-view mirrors on cars

12. ONE MINUTE TO THINK OF AN ANSWER WITH YOUR PARTNER
Refraction
Define Refraction
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The bending (or change in direction) of a wave as it moves from one medium into another

13. ONE MINUTE TO THINK OF AN ANSWER WITH YOUR PARTNER
Refraction
What are some common places where we will observe refraction?
List 3
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14. Refraction
When light travels from a less dense medium into a denser medium, it bends toward the Normal

15. Refraction
When light travels from a more dense medium into a less dense medium, it bends away from the Normal

16. Refraction

17. Physical Science: Optics
Outcome C3 – Comparing visible light to other types of electromagnetic radiation

18. Review: Electromagnetic radiation
Electromagnetic radiation is the transmission (movement) of energy in the form of waves.
These waves range from long radio waves to very short gamma rays
The electromagnetic spectrum is the range of energies that include long radio waves, microwaves, infrared waves, visible light waves, ultraviolet waves, X-rays and gamma rays.

19. Electromagnetic spectrum

21. TURN TO YOUR PARTNER (TTYP)
Question:
Wavelengths longer than visible light include?????
Radio waves, microwaves, infra-red waves
Wavelengths shorter than visible light include?????
UV rays, x-rays, gamma rays

22. Electromagnetic radiation – WHAT IS IT EVEN GOOD FOR?!
Other types of electromagnetic radiation include:
Radio waves microwaves

23. Electromagnetic radiation – WHAT IS IT EVEN GOOD FOR?!
Other types of electromagnetic radiation include:
Infrared Ultraviolet

24. Electromagnetic radiation – WHAT IS IT EVEN GOOD FOR?!
Other types of electromagnetic radiation include:
X-rays gamma rays

25. Electromagnetic radiation
How are these different?
TURN TO YOUR PARTNER AND ANSWER:
What 3 differences does electromagnetic radiation have from one another… For example, when you compare UV rays to Radiowaves
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