A positive lens has a focal length f.The image is the same size as the object when
A)the object is at the focal point.
B)the image is on the opposite side of the lens from the object and is the same distance from the lens as the object.
C)the image is on the same side of the lens as the object and is the same distance from the lens as the object.
D)The image can never be the same size as the object.
E)None of these is correct.

Question

Quizplus · Accepted Answer

By the lens formula, when the object distance is equal to the focal length, the image will be formed at infinity. Therefore, to have the same size image, the image distance should be equal to the object distance, which is not possible in option A. Option C is not possible as the image will always be inverted and on the opposite side of the lens. Option D is not correct as we have already found a valid option.

A Positive Lens Has a Focal Length F