1. The focusing of a parallel beam of light to a focus
is reversible:

2. 3 easy to trace lines can help locate the image formed by a lensq q M= p
With the magnification,

3. 1 2 3 4 5 f The ray entering this diverging
lens, parallel to its axis, exits the
other side following which ray? 5

4. The divergence by a concave lens should be reversible as well!

5. 1 2 3 f 4 Which ray entering 5 the diverging lens exits the other side
parallel to its axis? 5

6. 3 easy to trace lines can help locate the image formed by a lensq f q M= p
With the magnification still,

7. = + 1 f 1 p 1 q When viewing objects by eye, which variable(s)=
When viewing objects by eye, which variable(s)
of the lens equation must always remain fixed?
the focal length, f
the object distance, p
the image distance, q
(4)both f and p
(5)both f and q
(6)both p and q

8. For everyone there is a NEAR POINT,
the closest position you can focus on f
Any closer, the lens
cannot accommodate.
The eye strains to
hold f this small.

9. must be proportional to1 f 1 p 1 q = ho q p
The retinal image size
must be proportional to
the focal length, f of the lens
the object distance, p
the image distance, q
(4)the object size, ho
(5)both p and q
(6)both p and ho

10. ho   q

11. A jeweler whose near point is 40 cm, examines
a diamond with a small magnifying glass.
The lens has a focal length of 5 cm and the
image is -185 cm from the lens.
Determine the angular magnification.
Where should the image be located for
viewing without eyestrain?
What is the magnification then?
c)What maximum magnification is possible?

12. Determine the angular magnification.
A jeweler whose near point is 40 cm, examines a diamond
with a small magnifying glass. The lens has a focal length
of 5 cm and the image is -185 cm from the lens.
Determine the angular magnification.
b)Where should the image be located for
viewing without eyestrain?
What is the magnification then?
c)What maximum magnification is possible?
Want q=- , so 1/q = 0 
When q=-N 

13. 2 2 Directed away from the focus on far side.
Some answers: 2
Directed away from the focus on far side. 2
Directed toward the focus on near side.
(3) the image distance, q