What is Focal length?
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the distance between the centre of a mirror or a lens band its focus is called focal length.
focal length is measured in millimetres
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the distance between pole of a mirror and the focus is called the focal length.
for lense
the distance between the optic centre and focus is called focal length of a lense
for lense
the distance between the optic centre and focus is called focal length of a lense
helen52:
u r welcome
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