The focal length F of a lens made by combining two lenses of focal length U and V is given I/F=I/U+I/V A. make V the subject of the formula.
B. find V when F=6,U=10

a).

b). V = 15 units

Step-by-step explanation:

Focal length F of a lens made by combining two lenses of different focal lengths U and V will be,

A). By solving the given formula,

B). If F = 6 and U = 10 then we have to find the value of V.

    By substituting the given values in the formula,

    V = 15 units

    Therefore, focal length (V) of the lens = 15 units

c. y = 1/4 x + 5

step-by-step explanation:

first, put the equation of the line on the graph into slope-intercept form

(y = mx + b):   y = -4x + 8

second, a perpendicular line has to have "an opposite/reciprocal slope" to the original slope. so, find the "m" value in your original equation (it's -4, right? )

original slope: m = -4   perpendicular slope: change the sign to its opposite and find the reciprocal ("flip" the number)

new slope is now positive (b/c the original slope was negative 4), and it's 1/4 (not the original slope of 4 or 4/1)

i’ll just s take the points thxs