Exam-style question
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How does a converging lens affect light rays that are parallel to its principal axis?.
- A.It causes them to diverge.
- B.It causes them to converge at the focal point.
- C.It has no effect on the light rays.
- D.It reflects them back.
Model answer
What a good answer should say
- It causes them to converge at the focal point.
Explanation
Why this works
A converging lens refracts parallel light rays so that they meet at a point known as the focal point. This is a fundamental property of converging lenses used in image formation.
Common mistake
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