Answer:
The focal width is 4 unit.
Step-by-step explanation:
The given function of the parabola is,
[tex]x=\dfrac{1}{4}\cdot y^2[/tex]
[tex]\Rightarrow y^2=4x[/tex]
The general form of the parabola is,
[tex](y-k)^2=4p\cdot (x-h)[/tex]
where,
[tex](h,k)[/tex] is the vertex.
and [tex]4p[/tex] is the focal width.
Focal width is the distance between the two sides of the parabola when they have the same value as the focus.
Comparing the given parabola equation with the general form we get,
[tex]\Rightarrow 4p=4[/tex]
