[" 8A double convex lens of focal length...

[" 8A double convex lens of focal length "20cm" is made of glass of refractive index "3/2.],[" When placed completely in water "(a mu_(w)=4/3)," its focal length will be "],[[" (a) "80cm," (b) "15cm],[" (c) "17.7cm," (d) "22.5cm]]

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[" 8A double convex lens of focal length "20cm" is made of glass of refractive index "3/2.],[" When placed completely in water "(a mu_(w)=4/3)," its focal length will be "],[[" (a) "80cm," (b) "15cm],[" (c) "17.7cm," (d) "22.5cm]]

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