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A biconvex lens has a focal length $f_a = 10 \text{ cm}$ in air ($\mu_g = 1.5$). If it is immersed in a liquid of refractive index $\mu_l = 1.5$, what will be its new focal length $f_l$?
- A.10 cm
- B.20 cm
- C.Infinity
- D.Zero
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Correct answer: C — Infinity
Solution
. Since , the term , so .
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