1. 14-2 Thin lenses

2. A lens is a transparent object that refracts light rays, causing them to converge or diverge to create an image.

3. 2 basic types of lenses Convex (converging) lens thicker in the center
refracts parallel rays of light causing them to come together.
Concave (diverging) lens
thinner in the center
refracts parallel rays of light so that they diverge.

4. The focal length, f, is defined as the distance an image will form from the lens when the object is placed at infinity.

5. Light travels both ways

6. Use Ray Diagrams to locate images
A ray is drawn parallel to the principal axis and passes through F.
A ray is drawn through the focal point and emerges parallel to the principal axis.
A ray is drawn through the optical center and continues

9. Convex lenses form real and virtual images

10. Concave lenses form virtual images

11. Thin Lens Equation
Equation applies when the lens thickness is much smaller than its focal length.

12. Magnification

13. Image formation by the eye

14. Eyeglasses