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Practice question

MCQ

Question

A convex lens (\( f = 25 \, \text{cm} \)) and a concave lens (\( f = 50 \, \text{cm} \)) are in
contact. What is the effective focal length?

Options

Choose one · Correct answer highlighted

Explanation

**Power of lens** P (D) = 1/f (m), +5 D => f=1/5=0.2 m=20 cm. Virtual magnified image by convex lens when object within focal point, u

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