A convexo-concave convergent lens is mad...

A convexo-concave convergent lens is made of glass of refractive index 1.5 and focal length `24 cm.` Radius of curvature for one surface is double than that of the other. Then,radii of curvature for the two surfaces are (in cm)

`6,12`

`12,24`

`3,6`

`18,36`

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