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AP Physics 2
13.4 Images Formed by Lenses
IntermediateMCQConceptual23.1k
A horizontal dashed line represents the principal axis. On the left, a point source S lies on the principal axis, emitting two light rays that travel upward-right and downward-right toward a vertical dashed line representing a thin lens. The angle between these incident rays is labeled \(\theta_{\text{in}}\). To the right of the lens line, the two rays continue traveling to the right while diverging, but at a smaller angle relative to each other, labeled \(\theta_{\text{out}}\). No focal points, image points, or ray extensions are shown. No other labels, lines, or text appear.
Light rays from a point source passing through a thin lens.
A point source of light is placed on the principal axis of a thin glass lens, at a distance \(d\) from the lens. The light source produces a diverging cone of rays with opening angle \(\theta_{\text{in}}\). Upon exiting the lens, the rays continue to propagate as a diverging cone, but with a smaller opening angle \(\theta_{\text{out}} < \theta_{\text{in}}\). Which of the following correctly identifies the type of lens and the nature of the image formed?

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