define principle of focus
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principal focus, focus the point on the axis of a lens or mirror to which parallel rays of light converge or from which they appear to diverge after refraction or reflection.
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It is A point on the principle axisof the mirror at which the light rays coming parallel to principal axix ,after reflection actually meet,or appear to be coming from.
It is represented by F.
For A concave mirror, the focus is in the front of the mirror, while for convex mirror, the focus is behind the mirror....
The focus of A concave mirror is real...
The focus of a convex mirror is virtual...
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