Concept explainers
(a)
To find:The equation for the cross section of the reflector.
(a)
Answer to Problem 99E
The equation for the cross section of the reflector is
Explanation of Solution
Given information:
The filament of an automobile headlight is at the focus of a parabolic reflector, which sends light out in a straight beam.(See figure). The filament of the headlight is
Calculation:
As clear from the figure that the cross section is in form of a rightwards parabola.
As the filament is placed at focus of the parabola and it is
So, the value of
The general equation of the parabola is 3
Substitute
Therefore, the equation for the cross section of the reflector is
(b)
To calculate:The depth of the reflector.
(b)
Answer to Problem 99E
The depth of the reflector is
Explanation of Solution
Given information:
The filament of an automobile headlight is at the focus of a parabolic reflector, which sends light out in a straight beam.(See figure). The reflector is
Calculation:
As calculated in part(a) the equation of the cross section is
As the depth of the reflector is
Substitute
Therefore, the depth of the reflector is
Chapter 9 Solutions
PRECALCULUS W/LIMITS:GRAPH.APPROACH(HS)
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