1. A double convex lens has radii of curvature 20 cm and 30 cm respectively. Calculate its focal length in air and water. Given refractive vel index of glass w.r.t. air is 1.5 and that of water w.r.t, air is 1.33.
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. A double convex lens has radii of curvature 20 cm and 30 cm respectively. Calculate its focal length in air and water. Given refractive vel index of glass w.r.t. air is 1.5 and that of water w.r.t, air is 1.33.