Question

what i meant by principal focus
of conuer meerd,​

Answer 1

Answer:

Principal focus is a point on the principal axis of a concave lens, where parallel beam of light rays travelling parallel to principal axis, after passing through the concave lens the refracted rays diverge appear to come from one point

Explanation:

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Answer 2

Answer:

The focus for a beam of incident rays parallel to the axis is called principal focus.

Focus is the point where light rays originating from a point on the object converge. The principal focus is defined as the point where a beam parallel to the principal axis appears to diverge converges from a point on the principal axis after passing through the lens.

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