What is the image distance of an object 1.85 m in front of a converging lens of focal length 26.3 cm?
A)+ 23.0 cm
B)-1.99 cm
C)+ 30.6 cm
D)+ 159 cm
E)+ 4.80 cm

Question

Quizplus · Accepted Answer

The thin lens equation is: 
1/f = 1/di + 1/do 
where f is the focal length of the lens, di is the image distance, and do is the object distance. 
Substituting in the given values: 
1/0.263 = 1/di + 1/1.85 
Solving for di, we get: 
di = 0.306 m 
Converting to cm, we get: 
di = 30.6 cm 
Therefore, the image distance is +30.6 cm, which means the image is formed on the same side of the lens as the observer. The answer is C.

What Is the Image Distance of an Object 1