There were 4 different versions of the exam. The versions had the same questions and answers, but the order of the answers was different in each version. The correct answer to each question is identified by an asterisk in the following text.

Each correct answer counts 5 points and there is no partial credit.

1. The image produced by a plane mirror is

(*) Always virtual and the same size and orientation as the object

() Smaller than the object when the object is far from the mirror

() Inverted when the object is close to the mirror

() Larger than the object when the object is near the mirror

() Always real and the same size and orientation as the object

2. If a lens has a strength of +5 diopters, then it is

(*) double convex with a focal length of 20 cm

( ) double convex with a focal length of 20 mm

( ) double concave with a focal length of 5 m

( ) double convex with a focal length of 5 m

( ) double convex with a focal length of –20 cm.

3. If a lens has a focal length of –50 cm, then it is

(*) double concave with a strength of -2 diopters

( ) double concave with a strength of 2 diopters

( ) double convex with a strength of 2 diopters

( ) double convex with a strength of –2 diopters

( ) double concave with a strength of –0.02 diopters

4. A certain lens produces an image that is 5 cm tall when the object is 10 cm tall. The magnification is

(*) ½

( ) 2

() 5

() 10

() none of the above

5. In order to increase the depth of field when taking a picture, you should

(*) Use a larger f/number and a longer exposure time

() Use a smaller f/number and a longer exposure time

() Use a larger f/number and a shorter exposure time

() Use a smaller f/number and a shorter exposure time

() Use a faster shutter speed and a film with a higher ASA rating

6. If you shorten the exposure time by a factor of 2, then to keep the exposure correct you should also

(*) Increase the ASA rating of the film by a factor of 2

() Increase the f/number by a factor of 2

() Decrease the ASA rating of the film by a factor of 2

() Increase the f/number by a factor of 4

() Increase the f/number by a factor of 1.4

7. If you double the focal length of a lens leaving everything else unchanged, then

(*) the f/number increases by the same factor

() the f/number decreases by the same factor

() the field of view increases by the same factor

() the magnification decreases by the same factor

() the f/number increases, but not by the same factor

8. Spherical aberration is caused by

(*) rays at different distances from the axis having different effective focal lengths

( ) using a lens whose front surface is spherical but whose back surface is a plane

() not using a curved screen to show the image

() the magnification increasing as the diameter of the lens increase

() using a lens whose front surface is not exactly spherical

9. It is easier to read very small print in brighter light because

() the brighter light activates the rods in the eye

(*) the brighter light causes the pupil to close, which increases the depth of field

() the brighter light causes the pupil to close, which decreases the depth of field

() the brighter light decreases the chromatic aberration of the eye lens

() the brighter light increases the sensitivity of the retina

10. A lens whose focal length is 50 cm is placed in contact with a second lens whose focal length is 10 cm. The strength of the combination is

(*) 12 diopters

( ) 60 diopters

() 8 diopters

() 40 diopters

() none of the above

11. The image produced by a negative lens is

(*) Always virtual and erect

() Always erect, but can be real or virtual depending on object location

() Always inverted, but can be real or virtual depending on object location

() Always virtual and inverted

() the size and type of the image depend on the location of the object

12. When an object is at a very great distance from a concave mirror, the image is

(*) real, inverted and smaller than the object

( ) real, erect and smaller than the object

() virtual, inverted and smaller than the object

( ) virtual, erect and smaller than the object

( ) real, inverted, and larger than the object

13. The radius of curvature of a concave mirror is 50 cm. The focal length is

(*) 25 cm

( ) 100 cm

( ) 200 cm

( ) 12.5 cm

( ) none of the above

14. A camera light meter shows the correct exposure to be 1/100 s at f/8. Other correct combinations would be

(*) 1/200 s at f/5.6

( ) 1/200 s at f/11

( ) 1/200 s at f/16

( ) 1/50 s at f/5.6

( ) 1/50 s at f/4

15. If a ray passing through the center of a lens continues on the other side without change of direction, then

(*) the lens must be thin but can have any shape

( ) the lens must be thin and must have a double convex shape

( ) the lens must be thin and must have a double concave shape

( ) the lens can have any shape and any thickness

( ) the lens can have any thickness but must have a positive focal length

16. The field of view of a convex mirror is

(*) larger than for a plane mirror of the same size

() smaller than for a plane mirror of the same size

() larger than for a plane mirror of the same size but only for objects near the axis

() smaller than for a plane mirror of the same size only for objects near the axis

() independent of the diameter of the mirror

17. A mirror has a radius of curvature of 2 m and its f/number is f/2. Its diameter is

(*) 50 cm

() 25 cm

() 1 m

() 2 m

() 4 m

18. The image produced by a concave mirror is

() always virtual for all object distances

() always real for all object distances

(*) real for large object distances and virtual for small object distances

() virtual for large object distances and real for small object distances

() always larger than the object for all distances

19. An object is placed in front of a double convex lens at a distance from the lens of less than its focal length. The image is

() real, inverted and on the other side of the lens

(*) virtual, erect and on the same side of the lens

() virtual, inverted and always larger than the object

() real, erect and on the same side of the lens

() real, smaller than the object and on the other side of the lens

20. Compared to a standard camera lens, a telephoto lens of the same diameter has

() a larger focal length and a greater field of view

() a smaller focal length and a smaller field of view

(*) a larger f/number and a smaller field of view

() a smaller f/number and a larger field of view

() a smaller f/number and a larger magnification