Why does a concave lens spread out light rays? The answer lies in its shape and optical behavior:
Thinner at the centre, thicker at the edges.
Parallel rays entering the lens are refracted away from the principal axis.
The rays appear to diverge from a virtual focal point.
Exam tip: don’t just memorize “concave lens.” Write the scoring clue: parallel rays diverge after refraction. That’s the keyword examiners look for.
AHA! Concave lens spreads light. Not by sight, but by INSIGHT!
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