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Rays of light travelling parallel to the principal axis of a concave lens behave in which way after refraction?
AConverge to a real focus on the axis
BDiverge, appearing to come from a focus
CContinue without any bending at all
DReflect straight back along the axis
Answer & Solution
Correct answer: B. Diverge, appearing to come from a focus
1. A concave lens is a diverging lens, so parallel rays spread apart after refraction.
2. The diverged rays appear to originate from the principal focus on the same side as the object.
3. Convergence describes a convex lens, so that option is incorrect.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 7 "Lenses", p.90_
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