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i have converted pointcloud into laser scan....

From you question, I am guessing that you are using depthimage_to_laserscan package. If not, then you can consider using it. Because it does exactly what you are looking for.

how can i access to the values for instance less than 10 in my laser scan data??

"less than 10", I assume the unit is in meters. In you are using the depthimage_to_laserscan package, you should set the ~range_max parameter. Surprisingly, the default value is 10 meters. I suggest you check out the wiki page for more information.