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Question
Complete the following diagram and state what happens to the ray of light after refraction through the lens.

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Solution
A ray of light parallel to the principal axis, after refraction by the lens, either passes through its principal focus or appear to pass through its principal focus.

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RELATED QUESTIONS
In figure, (a) and (b), F1 and F2 are the two foci of thin lenses and AB is the incident ray. Complete the diagram to show the path of the ray AB after refraction through each lens.
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