42. A converging glass lens with a refractive index of 1.5 is placed in water with a refractive inde
問題詳情
42. A converging glass lens with a refractive index of 1.5 is placed in water with a refractive index of 1.25. How many times offocal length of the lens will be changed in water? (A) 0.3 (B) 0.8 (C) 1.5 (D) 2 (E) 2.5