1. Chapter 7 Light and Geometric Optics

2. 7.1 Reflection

3. Heat Transfer by Radiation
Energy transmitted via RADIATION will be in the form of ELECTROMANETIC
WAVES and will travel at the SPEED OF LIGHT

4. Heat Transfer by Radiation
The various forms of RADIANT ENERGY (which originate in the SUN)

5. The Electromagnetic Spectrum
All the different forms of electromagnetic radiation that occur in nature =

6. Wavelength – Frequency – Energy
long Wavelength =
low Frequency =
low Energy

7. Wavelength – Frequency – Energy
short Wavelength =
high Frequency =
high Energy

8. Visible Light
light that our eyes can detect
visible light can be separated into its colors using prisms

9. Infrared Radiation has the greatest heating effect
Provides most of the thermal energy requirements of the planet

10. Infrared Radiation

11. Ultraviolet Radiation
DAMAGING: responsible for sun tans and sun burns

12. Ultraviolet Radiation
Black Lights are sources of UV Radiation

13. Linear Propagation Of Light
Light travel in straight lines (most of the time)
Even thought the light has a wave – like properties it can be approximated as rays
rays = straight arrows

14. Ray Diagrams
Ray of light is coming from the top of the candle and moving towards the mirror
For you to see the image of the candle in the mirror, the light needs to be reflected back to your eye
We complete the diagram by drawing another ray pointed to the direction of the eye

15. The Law of Reflection
A ray approaching a mirror is called: INCIDENT RAY
A ray that is reflected by a mirror is called: REFLECTED RAY
The dashed line perpendicular to the mirror: THE NORMAL

16. THE ANGLE OF REFLECTION
The Law of Reflection
The angle between the INCIDENT RAY and NORMAL:
THE ANGLE OF INCIDENCE
The angle between the REFLECTED RAY and NORMAL:
THE ANGLE OF REFLECTION

17. INCOMING and REFLECTED angles are EQUAL
The Law of Reflection
INCOMING and REFLECTED angles are EQUAL

18. The Image Formation in a Plane Mirror
Flat mirror = a PLANE MIRROR

19. The Image Formation in a Plane Mirror
If an object is placed at a distance in front of a flat mirror and light is bounced off the object and reflect from the mirror’s surface.
These rays appear to come from a location on the other side of the mirror. As a convention, an object’s image is said to be at this location behind the mirror because the light appears to come from that point.
Virtual Image

20. A VIRTUAL IMAGE
The image formed by rays that appear to come from the image point behind the mirror—but never really do—is called a

21. An exact reflection of the real object:
A VIRTUAL IMAGE
The image formed by rays that appear to come from the image point behind the mirror—but never really do—is called a
An exact reflection of the real object:
Same size as the original object
It is upright
Same distance from the mirror as the object is from the mirror (p = q)
p = object distance
q = image distance
Image is REVERSED

22. An exact reflection of the real object:
A VIRTUAL IMAGE
The image formed by rays that appear to come from the image point behind the mirror—but never really do—is called a
An exact reflection of the real object:
Same size as the original object
It is upright
Same distance from the mirror as the object is from the mirror (p = q)
p = object distance
q = image distance
Image is REVERSED

23. DRAWING A VIRTUAL IMAGE

24. Same distance from the mirror Less of your image is viewable
The dark outside allows you to see reflection from glass
Same distance from the mirror
behind
Less of your image is viewable

25. 7.1 Review Questions (all)