Answer
a) Diverging lenses (concave).
b) 33 cm.
Work Step by Step
a) The negative sign indicates that these are diverging lenses (concave).
b) Focal length $f=\frac{1}{P}=\frac{1}{-3.0 D}=0.33 m$
In centimetres, f= 33 cm
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
Published by
Pearson
ISBN 10:
0-32160-183-1
ISBN 13:
978-0-32160-183-4
Chapter 25 - Vision and Optical Instruments - Learning Path Questions and Exercises - Exercises - Page 871: 2
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