optics

A liquid of refractive index e n e_n ; is poured onto the concave surface of concave-convex lens. R 1 R_1 and R 2 R_2 are the radii of curvature of convex and concave surfaces of the lens, respectively, and R 1 = 2 R 2 R_1= 2R_2 . The refractive index of material of lens is n 1 n_1 . For which combination of n 1 n_1 and n 2 n_2 does the whole system behaves as a diverging lens?

n 1 = 1.56 , n 2 = 1.33 n_1=1.56,n_2=1.33 n 1 = 1.2 , n 2 = 1.8 n_1=1.2,n_2=1.8 n 1 = 1.7 , n 2 = 1.33 n_1=1.7,n_2=1.33 n 1 = 1.63 , n 2 = 1.35 n_1=1.63,n_2=1.35

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