An object is placed at a distance of 58 cm from a thin lens along the axis.If a real image forms at a distance of 39 cm from the lens,on the opposite side from the object,what is the focal length of the lens?

Question

Quizplus · Accepted Answer

The correct answer is A.The focal length of a thin lens can be calculated using the thin lens equation:1/f = 1/do + 1/diwhere f is the focal length, do is the object distance, and di is the image distance.In this case, do = -58 cm (since the object is on the opposite side of the lens from the image) and di = 39 cm. Substituting these values into the thin lens equation, we get:1/f = 1/-58 cm + 1/39 cm1/f = -1/58 cm + 1/39 cm1/f = 1/23 cmf = 23 cmTherefore, the focal length of the lens is 23 cm.

An Object Is Placed at a Distance of 58 Cm