Question

define focus for class 7th​

Answer 1

Explanation:

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.

Answer 2

Answer:

Focus is the point where light rays originating from a point on the object converge

I think that it will help you