Waves Practice Problem Set Worksheet Page 20
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ECHANICS
RACTICE
ROBLEM
ETS
c. How far was the object placed in front of the mirror? Answer: 19.2 cm
5.
An inverted image has a magnification of 2 when the object is placed 22 cm from
a convergent mirror. What are the image distance and the focal length of the
mirror?
Answer: d
= 44 cm
i
f = 14.7 cm
8.1.3 Reflection and Mirror Review
1. (G1) Suppose that you want to take a photograph of yourself as you look at your
image in a flat mirror 1.5 m away. For what distance should the camera lens be
focused?
Answer: 3.0 m
2. (G4) A person whose eyes are 1.62 m above the floor stands 2.10 m in front of a
vertical plane mirror whose bottom edge is 43 cm above the floor, as shown. What is
the horizontal distance x to the base of the wall supporting the mirror of the nearest
point on the floor that can be seen reflected in the mirror?
Answer: 76 cm
3. (G5) Two mirrors meet at a 135° angle. If light rays strike one mirror at 40° as
shown, at what angle do they leave the second mirror? Answer: 5°
4. (G9) A solar cooker, really a convergent mirror pointed at the sun, focuses the Sun’s
rays 17.0 cm in front of the mirror. What is the radius of the spherical surface from
which the mirror was made?
Answer: 34.0 cm
5. (G12) How far from a convergent mirror (radius 27.0 cm) must an object be placed if
its image is to be at infinity?
Answer: 13.5 cm
6. (G12) If you look at yourself in a shiny Christmas tree ball with a diameter of 9.0 cm
when your face is 30.0 cm away from it, where is your image located?
Answer: -2.09 cm
a. What is the image’s magnification?
Answer: +0.070
b. Is it real or virtual? Is it upright or inverted?
Gamzon & Gregorian-Michaelsen
6/7/16
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