The thin lens equation describes the relationships between the distance of an object from the lens (d), the distance of the image from the lens (g), and the focal length of the lens ().
*+-;
If the object distance (d) is twice the image distance (g), what is the object distance when the
focal length is 10 centimeters?
A 5 centimeters
B. 10 centimeters
C 15 centimeters
D. 30 centimeters

step-by-step explanation:

first, eliminate the parenthesis:

3

x

+

2

−

4

x

second, group like terms:

3

x

−

4

x

+

2

third, combine like terms:

(

3

−

4

)

x

+

2

→

−

1

x

+

2

→

−

x

+

2

b. 18

step-by-step explanation:

so the equation for this is:

ab^2=ac⋅ad

ab being the top length of 6 and ac being the length of 2 and ad being the length of x. let's plug into the equation:

6^2 = 2x

now lets just solve for x:

36 = 2x

18 = x

i hope that !

doubled

step-by-step explanation: