1. Chapter 7 Light and Geometric Optics

2. 7.4 OPTICS

3. What is a Lens?
a transparent object that refracts light rays such that they converge or diverge to create an image

4. Types of Lenses Converging Lenses Diverging Lenses
The lens that is thicker at the middle than it is at the rim
The lens that is thinner at the middle than it is at the rim,

5. Types of Lenses Converging Lenses Diverging Lenses The light
The lens that is thicker at the middle than it is at the rim
The lens that is thinner at the middle than it is at the rim,
The light
rays show why the names converging and diverging are applied to these lenses.

6. Types of Curved Mirrors
Concave Mirrors
Used whenever a magnified image of an object is needed
They can also produce inverted, small images
They produce “real images”
Real image = an image that can be projected onto a screen

7. Double Convex Lens

8. Double Convex Lens Why there are two Focal Points?
Two Centres of Curvature (C1 and C2)
For a symmetrical lens:
OC1 = OC2
Two Focal Points F1 and F2(called Principal Foci)
Also called the Primary and Secondary Focus
Why there are two Focal Points?

9. Predicting Where Images Will Form

11. Predicting Where Images Will Form

12. The Lens Equation

13. Describe The Image Produced
An object is placed 30.0 cm in front of a converging lens and then 12.5 cm in front of a diverging lens. Both lenses have a focal length of 10.0 cm. For both cases, find the image distance and draw the ray diagrams.
a real (q > 0),
inverted,
smaller image
Describe The Image Produced

14. Describe The Image Produced
An object is placed 30.0 cm in front of a converging lens and then 12.5 cm in front of a diverging lens. Both lenses have a focal length of 10.0 cm. For both cases, find the image distance and draw the ray diagrams.
a real (q > 0),
inverted,
smaller image
Describe The Image Produced

15. Describe The Image Produced
An object is placed 30.0 cm in front of a converging lens and then 12.5 cm in front of a diverging lens. Both lenses have a focal length of 10.0 cm. For both cases, find the image distance and draw the ray diagrams.
a virtual (q < 0),
inverted,
smaller image
Describe The Image Produced

16. 50.5 mm
1.00 x 102 mm
20 mm

17. On your own: read pg

18. 7.4 Review Questions (1 – 5, 8 – 11)

19. Chapter 7 Review (3, 6 – 12, 14 – 16, 18, 19, 20, 22 – 26 )