The distance of the object is 30 cm, the image distance is 60 cm. What is the focal length of this converging lens?
To find the focal length of a converging lens, we can use the lens formula:
1/f = 1/di - 1/do
Where f is the focal length, di is the image distance, and do is the object distance.
Given:
do = 30 cm
di = 60 cm
Plugging in the values into the formula:
1/f = 1/60 - 1/30
Now, let's simplify this equation:
1/f = (1 - 2) / 60
1/f = -1/60
To get f alone, we can take the reciprocal of both sides:
f = -60/1
Thus, the focal length of this converging lens is -60 cm.