Home Work 7

Home Work 7

3/3/15, 9:30 AM

Home Work 7
Due: 11:59pm on Monday, March 9, 2015
You will receive no credit for items you complete after the assignment is due. Grading Policy

Problem 23.08
A solar cooker, really a concave mirror pointed at the Sun, focuses the Sun's rays 19.3

cm in front of the mirror.

Part A
What is the radius of the spherical surface from which the mirror was made?
Express your answer to three significant figures and include the appropriate units.
ANSWER:

r=

Problem 23.09

Part A
How far from a concave mirror (radius 23.4

cm ) must an object be placed if its image is to be at infinity?

Express your answer to three significant figures and include the appropriate units.
ANSWER:

d=

Problem 23.12
A dentist wants a small mirror that, when 2.50

cm from a tooth, will produce a 5.0 × upright image.

Part A
What kind of mirror must be used?
ANSWER:
convex concave https://session.masteringphysics.com/myct/assignmentPrintView?assignmentID=3348581

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3/3/15, 9:30 AM

Part B
What must its radius of curvature be? Follow the sign conventions.
Express your answer to two significant figures and include the appropriate units.
ANSWER:

r=

Problem 23.13
You are standing 3.0 actual height.

m from a convex security mirror in a store. You estimate the height of your image to be half of your

Part A
Estimate the radius of curvature of the mirror. Follow the sign conventions.
Express your answer to one significant figure and include the appropriate units.
ANSWER:

r=

Problem 23.21
A shaving or makeup mirror is designed to magnify your face by a factor of 1.40 when your face is placed 22.0 it. cm in front of

Part A
What type of mirror is it?
ANSWER:
convex concave Part B
Describe the type of image that it makes of your face. https://session.masteringphysics.com/myct/assignmentPrintView?assignmentID=3348581 Page 2 of 6

Home Work 7

3/3/15, 9:30 AM

ANSWER: upright, real and reduced inverted, real and reduced inverted, virtual and