Correct Answer: Option B

Explanation

F = \(\frac{UV}{U + V}\)

20 = \(\frac{60 \times V}{60 + V}\)

V = 30cm

similarly, \(\frac{U}{V}\) = \(\frac{\text{height of object}}{\text{height of image}}\)

\(\frac{60}{30}\) = \(\frac{3}{h}\)

h = 1.5cm

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