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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.
 
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