5.5 Carlota is standing 3.50 m from a wall. Her
friend Lily is standing 2.10 m from the same
wall, and they are 4.40 m from each other. If a
mirror is mounted on the wall with its edge
directly in front of Lily and extending toward
Carlota as in the illustration, how wide must
the mirror be for the friends to see each other
in the mirror?
mSection 9 - Spherical mirrors: focal length equation
9.1 A shiny metallic Christmas ball ornament 4.60 cm in diameter is used as a mirror. What is the mirror's focal length?
cm
9.2 You want to create a spherical mirror with a focal length of +15.0 cm. (a) Will the mirror be concave or convex? (b) What
must be the radius of curvature?
(a) Concave Convex
(b) cm
9.3 You are lost in the wilderness, carrying only a piece of aluminum foil. Thanks to diligent study in your biology class, you
remember which mushrooms are poisonous, and you are able to pick others that won't kill you. Your talents in basket weaving
also pay off magnificently, as you create a basket and devise a plan to line it with aluminum foil, making a solar cooker.
Mmmm, roast mushrooms! The basket is a section of a sphere with radius 21.0 cm. How far from the bottom of the basket
should you place the mushrooms to cook them most efficiently using the Sun's rays?
cmSection 14 - Interactive problem: image in a convex mirror
14.1 Use the simulation in the interactive problem in this section to answer the following questions. (a) Is the image ever inverted?
(b) Is the image ever larger than the object? (c) Is the image ever real? (d) Is the image ever farther from the mirror than the
object is?
(a) Yes No
(b) Yes No
(c) Yes No
(d) Yes NoSection 15 - Mirror equations
15.1 An object is 17.3 cm from a concave mirror of focal length 8.10 cm. (a) What is the image distance? State your answer with
the correct sign. (b) What is the magnification? (c) Is the image upright or inverted?
(a) cm
(b)
(c) i. Upright
ii. Inverted
15.2 Use the mirror equation to show that for a planar mirror, the magnitude of the image distance equals the magnitude of the
object distance. Hint: A planar mirror can be thought of as a spherical mirror with an infinite radius of curvature.15.3 The focal point of a convex mirror is 22.4 cm from the mirror's surface. An image seen in the mirror is between the mirror and
the focal point, 12.9 cm from the focal point. How far from the mirror is the object?
cm
15.4 A mirror creates an image of magnification í1/3. (a) Is the image upright or inverted? (b) If the object is 7.80 cm tall, what is
the height of the image? State your answer with the correct sign.(a) Upright Inverted
(b) cm(^594) Copyright 2000-2007 Kinetic Books Co. Chapter 31 Problems