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20. Which of the following can converge a light ray the most? (1) A convex lens of focal length \( 20 cm \) (2) A convex lens of focal length \( 10 cm \) (3) A concave lens of focal length \( 20 cm \) (4) A concave lens of focal length \( 10 cm \)

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20. Which of the following can converge a light ray the most? (1) A convex lens of focal length \( 20 cm \) (2) A convex lens of focal length \( 10 cm \) (3) A concave lens of focal length \( 20 cm \) (4) A concave lens of focal length \( 10 cm \)
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