Question

hloo guys....someone answer what is principal focus?

Answer 1

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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..

hope this answer helps you...❤❤✌✌

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Answer 2

Explanation:

Principal focus ;

The focus for a beam of incident ray parallel to the axis .

Hope ! it's helpful..