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[" From (ii) "x(v)" ,"t(1)=20" and "t(2)...

[" From (ii) "x(v)" ,"t_(1)=20" and "t_(2)=-30],[" A thin double convex lens has radiot curvature each of magnitude "40cm" and is made of glass with "],[" frefactive index "1.65" .It focal length is nearly "],[[" (1) "20cm," (2) "31cm," (3) "35cm," (4) "50cm]]

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