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defocus
(redirected from defocussing)

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de·fo·cus  (d-fks)
tr.v. de·fo·cused or de·fo·cussed, de·fo·cus·ing or de·fo·cus·sing, de·fo·cus·es or de·fo·cus·ses
To cause (a beam or a lens) to deviate from accurate focus.
n.
The act or result of causing a lens to deviate from accurate focus.
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The amount of defocussing is determined by the angle of divergence of the incident beam and distance of the focus from the receiving slit.
Fundamental parameters line profile fitting in laboratory ... by Cline, J.P. / Journal of Research of the National Institute of Standards and Technology
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