Question: Note down the focal length from the first par ( f 1 ) . In the second part, the whole experiment is performed underwater. Calculate

Note down the focal length from the first par (f1). In the second part, the whole experiment is performed underwater.
Calculate the focal length of the lens underwater(f2). The index of refraction for water is 1.33.
What is the ratio of two focal lengths (f2/f1)?

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