Question

( i ) Define Focus in short way​

Answer 1

Answer:

the centre of interest or activity.

"this generation has made the environment a focus of attention"

the state or quality of having or producing clear visual definition.

Answer 2

Answer:

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.

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