To build on what Ajay said, look at the DOF calculations below. With the settings you used. ISO 100 and F2, your DOF was about one inch total.
Higher ISA, smaller f stop, greater DOF.
Camera Make: Canon
Camera Model: Canon EOS DIGITAL REBEL XTi
Image Date: 2008:03:31 04:27:27
Flash Used: No
Focal Length: 50.0mm
CCD Width: 22.28mm
Exposure Time: 0.0020 s (1/500)
Aperture: f/2.0
ISO equiv: 200
White Balance: Auto
Metering Mode: Matrix
Exposure: aperture priority (semi-auto)
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