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A convex lens and a concave lens differ in that the convex lens makes parallel rays:
AStop at the surface
BChange their colour
CCross at one point
DSpread from the axis
Answer & Solution
Correct answer: C. Cross at one point
1. The two lens types are defined by opposite effects.
2. The concave lens is a diverging lens that bends rays away from its axis.
3. The converging lens takes rays entering parallel to its axis.
4. Those rays cross one another at a single point on the opposite side.
5. So the convex lens gathers where the concave lens spreads.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 25 'Geometric Optics', sections 25.1-25.7_
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