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What happens to several rays of light parallel to the principal axis after passing through (refracting from) a convex lens?

Question
What happens to several rays of light parallel to the principal axis after passing through (refracting from) a convex lens?
They diverge from a point on the principal axis
They converge to a point on the principal axis (the principal focus)
They remain exactly parallel with no change
They reverse direction completely
Answer
They converge to a point on the principal axis (the principal focus)
Detailed Explanation
The chapter states that parallel rays, after refraction through a convex lens, converge to the principal focus on the principal axis.
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