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The amount of light L admitted through the aperture of a camera lens is related to the f-stop setting, f, by..


The amount of light L admitted through the aperture of a camera lens is related to the f-stop setting, f, by the formula L = k/f^2, where k is a constant value dependent on the particular lens being used. What is the ratio of the amount of light admitted at a nf-stop setting of 22 to the amount of light admitted at an f-step setting of 11?

a. 4 to 1
b. 2 to 1
c. 1 to 2
d. 1 to 4

2. What is the simplified form of (y/3)+(3/y) / (3y)^-1 ?
a. y+3
b. y^2+9
c. y+9
d. y^2+9/9y^2

1.. d

an inverse relationship: the bigger the f-stop, the less the light
if f is halved (22 ==> 11), the amount of light is multiplied by 4

2. b

[(y/3) + (3/y)] / (3y)^-1 =
[(y^2 + 3^2) / (3y)] / [1/(3y)] =
[(y^2 + 3^2) / (3y)] * (3y / 1)= y^2 + 9 (b)

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