As shown in figure, a liquid of refractive index ‘_{2}’ is poured onto the concave surface of concave – convex lens. R_{1 }and R_{2} are the radii of curvature of convex and concave surfaces of the lens respectively and R_{1} = 2R_{2}. The refractive index of material of lens is _{1}. For which combination of _{1} and _{2}, the whole system behalves as a diverging lens.

(a)

_{1} = 1.2 and _{2 }= 1.8

(b)

_{1} = 1.63 and _{2 }= 1.35

(c)

_{1} = 1.56 and _{2 }= 1.33

(d)

_{1} = 1.7 and _{2 }= 1.33

Question ID - 154040 :-

As shown in figure, a liquid of refractive index ‘_{2}’ is poured onto the concave surface of concave – convex lens. R_{1 }and R_{2} are the radii of curvature of convex and concave surfaces of the lens respectively and R_{1} = 2R_{2}. The refractive index of material of lens is _{1}. For which combination of _{1} and _{2}, the whole system behalves as a diverging lens.

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