and (4,-7)points on the curve19 The mirror in Carl's flashlight is a paraboloid of revolution. If the mirror is 5 centimeters indiameter and 2,5 centimeters deep, where should the light bulb be placed so it is at the focusof the mirror?20. A parabolic Wi-Fi antenna is constructed by taking a flat sheet of metal and bending it into

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Asked Nov 6, 2019
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How do you solve question 19?

and (4,-7)
points on the curve
19 The mirror in Carl's flashlight is a paraboloid of revolution. If the mirror is 5 centimeters in
diameter and 2,5 centimeters deep, where should the light bulb be placed so it is at the focus
of the mirror?
20. A parabolic Wi-Fi antenna is constructed by taking a flat sheet of metal and bending it into
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and (4,-7) points on the curve 19 The mirror in Carl's flashlight is a paraboloid of revolution. If the mirror is 5 centimeters in diameter and 2,5 centimeters deep, where should the light bulb be placed so it is at the focus of the mirror? 20. A parabolic Wi-Fi antenna is constructed by taking a flat sheet of metal and bending it into

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Expert Answer

Step 1

Given:

The mirror in carl’s flashlight is a paraboloid of revolution. If the mirror is 5 centimeter in diameter and 2.5 centimeters deep.

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diameter(d) 5cm d 5 —ст 2 2 radius(r)

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Step 2

Concept used:

The equation of parabola:

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x2=4ay Here 5 x radius cm 2 y mirror depth 2.5cm a focus of the mirror

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Step 3

Find the value of “a” b...

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x2=4ay 5 x =-,y = 2.5 =4xax2.5 2 25 - = 10a 4 25 a 4x 10 5 a =- 8 a =0.625cm

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