1. 32 Optical Images image formation reflection & refraction
mirror & lens equations
Ch.32 homework: 25, 30-33,35,55-57, 78, 81(ans should be negative). (43 removed)

2. image formation
real image: rays converge to a point magnifier used to start paper on fire movie projector
virtual image: rays diverge from source “seeing” any real object or light source

3. Plane Mirror Image distances measured from mirror & axis
image height y’ = object height y
object distance s = image distance s’

4. Concave Mirror Image
distances measured from axis & from plane tangent to mirror at V
focal distance is half of curvature radius

5. principal rays 1) parallel ray 2) focal ray 3) radial ray
image is real, inverted, and smaller in this situation 1 2 3

6. convex mirror parallel and radial rays shown
image is upright, virtual, and smaller

7. Mirror Equations
you must learn the sign conventions to use these formulas

8. imbedded object
image distance < object distance

9. thin lenses have equidistant focal points on either side
converging & diverging types

10. lens equations

11. human eye
average index of refraction ~ 1.4

12. Far Sighted Eye
correction requires converging lens

13. near sighted eye
correction requires diverging lens

16. summary sections 1 & 2 human eye & refractive corrections
(omitting sections 3, 4)

17. Calculating Focal Length for a Thin Lens
Example: A double convex, thin glass lens with n = 1.5 has radii of curvature of 10 and 15cm. Find its focal length.

18. I O

19. Question: Reverse the designations in the example above
Question: Reverse the designations in the example above. Object is now the fish, so n1 = 1.33 (fish location). Let the fish be 10cm from bowl surface. Where is the image of the fish formed that the cat will see?
Answer:
s = 10cm , s’ = ?, r = -15cm, n1 = 1.33, n2 = 1.00.
 /s’ =  1/s’ =  s’ = -9.00cm

20. 2. A document is sealed in a glass cube (n=1
2. A document is sealed in a glass cube (n=1.5) at a depth of 10cm from one surface. Calculate s’ and m.
Object is in n1=1.5. Viewer is in air n2=1.00. Radius of surface is r = infinity.
 1/s’ =  s’ = -6.67cm. .

21. 32-3 Aberrations

23. 32-4 Optical Instruments

26. s, cat’s nose
n1 holds object, here equal to 1.00
/s’= 0.022
1.33/s’ =
s’ = -17.1cm