If a convex lens having focal length \( \mathrm{f} \) and refractiv...

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If a convex lens having focal length \( \mathrm{f} \) and refractive index \( 1.5 \) is immersed in water then new focal length will be \( \left(\mu_{\mathrm{w}}=4 / 3\right) \)
\( \mathrm{P} \)
(A) \( \mathrm{f} \)
(B) \( 1.5 \mathrm{f} \)
W
(C) \( \frac{4}{3} \mathrm{f} \)
(D) \( 4 \mathrm{f} \)
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