Question

define principal focus​

Answer 1

ANSWER -

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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Answer 2

Answer:

Principal focus-

The principal focus is 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.

Explanation:

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