REFLECTION REVIEW
a.
b.
c.
d.
Choose one of the following to answer questions 7 - 24. A response may be used more than once.
plane mirror
e. plane mirror or convex mirror
concave mirror
f. concave mirror or convex mirror
convex mirror
g. plane mirror, concave mirror, or convex mirror
plane mirror or concave mirror
h. No mirror
1. _____ What kind of mirror could you use to make images smaller than the object?
2. _____ What kind of mirror can only make an image the same size as the object?
3. _____ What kind of mirror could you use to make image distance less than object distance?
4. _____ What kind of mirror could you use to make image distance greater than object distance?
5. _____ What kind of mirror could you use to make image distance equal to object distance?
6. _____ What kind of mirror could you use to make images in front of the mirror?
7. _____ What kind of mirror could you use to make images behind the mirror?
8. _____ What kind of mirror could you use to make images only behind the mirror?
9. _____ What kind of mirror could you use to make images upright?
10. _____ What kind of mirror can only make inverted images?
11. _____ What kind of mirror could you use to only make images upright?
12. _____ What kind of mirror can make an upright image in front of the mirror?
13. _____ What kind of mirror could you use to make larger images in front and behind the mirror?
14. _____ What kind of mirror could you use to make smaller images in front and behind the mirror?
15. _____ What kind of mirror could you use to make virtual images?
16. _____ What kind of mirror can only make a virtual image?
17. _____ What kind of mirror could you use to make real images?
18. _____ What kind of mirror can only make a real image?
19. _____ There are five objects positioned in front of the plane mirror in the drawing below. Which one(s) will the observer
be able to see reflected in the mirror? You may choose more than one.
Plane Mirror
A
B
D
E
C
20. _____ The distance of an object from a concave mirror is varied until both object and image distances are 50 cm from
the mirror. What is the focal length of the mirror?
a. 25 cm
b 50 cm
c. 100 cm
d. 2500 cm
21. _____ A concave mirror has a radius of curvature of 20 cm. For which object distance will the image be real, inverted
and smaller than the object?
a. 5 cm
b. 10 cm
c. 15 cm
d. 18 cm
e. 25 cm
22. _____ Which is true concerning the image formed by a concave spherical mirror?
a. When the object is inside the focal point, the image is virtual.
b. When the object is outside the focal point, the image is virtual.
c. When the object is at the center of curvature, the image is formed at infinity.
d. When the object is inside the focal point, the image is inverted relative to the object.
e. When the object is outside the focal point, the image is upright relative to the object.
23. _____ The diagram shows an object located at point P, 0.25 meter from a
concave spherical mirror with principal focus F. The focal length of the
mirror is 0.10 meter. How does the image change as the object is moved
from point P toward point F?
a. Image distance decreases and image size decreases.
b. Image distance decreases and image size increases.
c. Image distance increases and image size decreases.
d. Image distance increases and image size increases.
24. _____ The table below lists object and image distances for five objects in front of mirrors. For which case was the image
formed by a convex spherical mirror?
Object distance
Image distance
a.
7.1 cm
18.0 cm
b.
25.0 cm
16.7 cm
c.
5.0 cm
-10.0 cm
d.
20.0 cm
-5.71 cm
e.
40.0 cm
-80.0 cm
25. _____ An object is 12 cm from a concave mirror. Its image is twice as tall as the object. The distance of the image from
the mirror is:
a. 4.0 cm
b. 6.0 cm
c. 24 cm
d. 48 cm
26. _____ In the demonstration “From Mirror to Infinity” I moved an object from the surface of concave mirror to far from
the mirror. Let’s say that when I had moved the object out to 100 cm from the mirror, the image was at this same
position as the object. What would the image be like if the object were now moved out to 200 cm from the mirror?
a. smaller than the object and real
c. smaller than the object and virtual
b. larger than the object and real
d. larger than the object and virtual
27._____ A concave mirror has a center of curvature of 20 cm. For what range of object distances will the image be real,
inverted and smaller than the object?
a. 0 – 10 cm
b. 10 cm – 20 cm
c. 20 cm
d. Beyond 20 cm
28.
In the table below, fill in the missing blanks.
Type
f (cm)
C (cm)
do (cm)
a.
b.
Convex
100
di (cm)
ho (cm)
-30
5
40
hi (cm)
M
3
7
c.
-200
100
1
d.
200
100
1
e.
20
f.
Concave
25
10
30
10
40
29.
Use the object and image distances below to decide which type of mirror would produce them.
Object Distance (cm)
Image Distance (cm)
25.0
25.0
30.0
-30.0
100.0
-10.0
15.0
-15.0
20.0
5.0
14.0
-15.0
30.
Type of Mirror (Plane, Concave, Convex, or None)
Make ray diagrams to locate the full images of the following objects.
C
f
C
C
f
f
31.
A thimble 2.5-cm high is 32.0 cm from a concave mirror. The center of curvature of the mirror is 22.0 cm. What is the
size of the thimble’s image?
32.
An object is placed 18 cm from a convex mirror, which has a center of curvature of 12.0 cm. The object is 15 cm tall.
How tall is the image?
33.
A concave mirror produces a real image that is half the size of the object when the object is 40 cm from the mirror.
What is the distance from the mirror to the center of curvature?
34.
A woman stands 2.0 m in front of a convex mirror and sees that her image height is 1/4 of her actual height. What is the
center of curvature of the mirror?
35.
A child 1.1 m tall is standing 6.0 m in front of a convex mirror with a focal length of 1.5 m. What is the size of her
image?
36.
A 40-cm tall image forms when an object is 60 cm from a 30-cm focal length concave mirror, How tall is the object?
The last four problems are for honors physics only
37. A man with a 30-cm tall head stands 1.0 m in front of a concave mirror and sees an upright image of head that is 45 cm
tall. How close would he need to stand in front of the mirror in order to produce an inverted image of his head that was
half its height?
38. A ball with a diameter of 10 mm is placed 100 mm in front of a concave mirror. A virtual image with a diameter of 40
mm is formed. Where could the ball be placed in order to produce a real image 30 mm in diameter?
39. A spherical mirror that is reflective on both sides produces an image that is 30% the size of the object when it is placed
1.0 m from the convex side of the mirror. What would the magnification be if the object were placed 0.5 m from the
concave side of the mirror?
40. In an experiment like the curved mirror lab, a light bulb placed 40 cm from a mirror produces an image that is clearly
focused on a screen 60 cm in front of the mirror? How far in front of the mirror would the light bulb need to be placed in
order to produce an upright image four times larger than the object?