1. Glencoe Chapter 18 Mirrors and Lenses
CP Physics
Glencoe
Chapter 18
Mirrors and Lenses

2. TEKS Objective: 8C The student is expected to:
Interpret the role of light wave characteristics and behaviors found in medicinal and industrial applications.

3. Mirrors
Three types of mirrors:
Plane
Concave
convex

4. Vocabulary do = distance the object is from the mirror
ho = height of the object
di = distance the image is from the mirror
hi = height of the image
Virtual image – is an optical illusion, cannot be projected onto a white screen.
Magnification = 1

5. Plane or flat mirror
The image produced by a flat mirror is behind the mirror
It is an optical illusion, it is a virtual image
It is upright
do= di
ho = hi

6. Flat mirror

10. Flat mirror has left and right hand reversal

11. Lenses: two main types Convex lens = converging lens
Concave lens = diverging lens
Eyeglasses were 1st made in the 13th century
Contacts were 1st made in Houston in 1888

12. Ray diagrams:
1st ray goes in parallel to principal axis, refracts at the line of symmetry, goes out through the focal point on the other side of the lens
2nd ray goes in through the focal point, refracts at the line of symmetry, and goes out parallel to the principal axis

13. Concave Lens Diverging lens Focal length is negative
Image is on same side as object
Image is virtual, upright and reduced
Corrects nearsightedness

15. 1st ray goes in parallel to the principal axis, refracts at the line of symmetry, and refracts out as if through the 1st focal point, must do a trace back
2nd ray goes from the top of the object straight through the center of the lens without refracting.

16. The Human Eye

18. Near sightedness

20. Far sightedness

22. Telescope
Two converging lenses