Answer
See explanations.
Work Step by Step
The receiver must be put at the focus for the disk to work and it may happen that the position of the focus ($p$-value) is higher for a shallow dish than that of a deeper dish.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 9 - Section 9.3 - The Parabola - Exercise Set - Page 998: 82
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