joejar3781 joejar3781

09-01-2024
Physics

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A convex lens of refractive index 1.5 has a focal length of 18 cm in air. Calculate its focal length when it is immersed in water of refractive index 43.take f1=18.
A. f1
B. 2f1
C. 3f1
D. 4f1

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