Diameter or aperture of a plano - convex lens is 6 cm and its thickness at the center is 3 mm. The image of an object formed is real and twice the size of the object. If the speed of light in the material of the lens is 2xx10^(8)ms^(-1). The distance where the object is placed from the plano - convex lens is .............. xx15cm.

Diameter or aperture of a plano - convex lens is 6 cm and its thicknes

1.	Diameter or aperture of a plano - convex lens is 6 cm and its thickness at the center is 3 mm. The image of an object formed is real and twice the size of the object. If the speed of light in the material of the lens is 2xx10^(8)ms^(-1). The distance where the object is placed from the plano - convex lens is .............. xx15cm.
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