Waves Practice Problem Set Worksheet Page 19
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ECHANICS
RACTICE
ROBLEM
ETS
9. One of Cinderella’s stepsisters, who is 1.60 m tall, is looking at herself in a plane
mirror when she spots one of the mice helping Cinderella at the very bottom of
the mirror. If the mouse is 5.0 cm away from the wall where the mirror is hung,
and the mirror’s edge is 60 cm from the floor, how far away is she from the
mouse? Make sure to draw a ray diagram to help solve this problem!
Answer: 3.3 cm from the mouse
8.1.2 Spherical Mirrors
1.
An action figure that is 8.0 cm tall is placed 23.0 cm in front of a convergent
mirror with a focal length of 10.0 cm.
a. Draw a ray diagram for the image of the action figure.
b. What are the three characteristics of the image?
Answer: Inverted, M<1, Real
c. What is the image distance?
Answer: 17.7 cm
d. What is the image height?
Answer: -6.15 cm
2.
If the 8.0 cm tall action figure from Question 1 is now placed 6.0 cm in front of a
divergent mirror with a radius of 24.0 cm.
a. Draw a ray diagram for the image of the action figure.
b. What are the three characteristics of the image?
Answer: Upright, M<1, Virtual
c. What is the image distance?
Answer: -4.0 cm
d. What is the image height?
Answer: 5.3 cm
3.
The focal point of a divergent mirror is 20.0 cm behind the mirror. An object is
placed 12 cm from the mirror.
a. Draw a ray diagram for the image of the object.
b. What is the image distance?
Answer: -7.5 cm
c. What is the magnification of the image?
Answer: M = 0.625 x
4.
A magnified, inverted image is located a distance of 32.0 cm from a spherical
mirror with a focal length of 12.0 cm.
a. Is it a convergent or divergent mirror? Explain.
b. Is the image real or virtual?
Gamzon & Gregorian-Michaelsen
6/7/16
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