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Practice question

MCQ

Question

A concave lens has a focal length of \( 20 \, \text{cm} \). Where should an object be placed to get an
image half the size of the object?

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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