Why does a convex lens focus light rays? The answer lies in its shape and optical behavior:
Thicker at the centre, thinner at the edges.
Parallel rays entering the lens are refracted towards the principal axis.
The rays meet at a real focal point (F).
Exam tip: don’t just look at the lens shape. Follow the rays — where do they go? The scoring clue is: parallel rays converge at the focal point after refraction.
AHA! Convex lens focuses light. Not by sight, but by INSIGHT!
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