The thickness at the centre of a plano convex lens is 3 mm and the diameter is 6 cm. If the speed of light in the material of the lens is 2 \times 10^{8}ms^{-1}. The focal length of the lens is ________.
 
Option: 1 0.30 cm
Option: 2 1.5 cm
Option: 3 15 cm  
Option: 4 30 cm

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