# As shown in figure, a liquid of refractive index ‘2’ is poured onto the concave surface of concave – convex lens. R1 and R2 are the radii of curvature of convex and concave surfaces of the lens respectively and R1 = 2R2. 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. R1 and R2 are the radii of curvature of convex and concave surfaces of the lens respectively and R1 = 2R2. 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

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Answer Key : (d) -

1 = 1.7 and 2 = 1.33

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 A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is cut (a) will be shifted downward (b) will be shifted upward (c) (d)

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