To correct Akio's mistake, what adjustment should be made?

• A. Change the lens so it appears convex instead of concave.
• B. Move the small car so it appears on the left side of the lens.
• C. Make the small car much larger than the other car.
• D. Draw the top ray so that it passes through the focal point on the right.

Answer: (B)

In lens diagrams, where the object sits relative to the lens is essential for tracing the light correctly. For a converging lens, the object should be placed on the incoming side (the left) so you can use the standard ray rules: a ray from the top of the object that travels parallel to the axis bends so it passes through the focal point on the opposite side, a ray through the focal point on the near side leaves parallel to the axis, and a ray through the center goes straight.

If the small car isn’t on the left side, those ray constructions won’t properly map where the image should form. Moving the small car to the left side fixes the setup so the rays can be traced consistently and the image position emerges as it should on the opposite side of the lens.

The other options change either the lens type, magnification, or a ray construction without addressing the object’s position, so they don’t properly correct the diagram in this context.