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Which of these is one of the standard ray-tracing rules for a converging lens?
AA ray entering parallel to the axis passes through the focal point on the far side
BA ray entering parallel to the axis always reflects straight back the way it came
CA ray entering parallel to the axis is absorbed and never leaves the lens
DA ray entering parallel to the axis always bends away from the axis on both surfaces
Answer & Solution
Correct answer: A. A ray entering parallel to the axis passes through the focal point on the far side
1. One ray-tracing rule states that a ray entering a converging lens parallel to its axis passes through the focal point on the far side.
2. This is one of the simple rules used to locate an image without doing any calculation.
3. Reflecting back, being absorbed, or bending away from the axis all describe the wrong kind of behaviour for a converging lens.
_Source: OpenStax Physics (CC BY 4.0), Ch 16 "Mirrors and Lenses", section 16.3 Lenses_
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