Question

what do you mean by focus and focal length​

Answer 1

Answer:

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Focal length is the distance between the principal focal point and the optical centre of the lens (located on the optical axis and in the "middle of the lens). More focal points could be found on the focus plane, a plane passing through the principal focus point and perpendicular to optical axis.

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Answer 2

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Being focused means that you have clear goals and objectives and your work is dedicated to achieving those goals and objectives. When you are deciding what you are going to do in any given moment; you base your decision on how you can make the most progress towards your goals with the time and resources available.

Focal length (shown in red) is the distance between the center of a convex lens or a concave mirror and the focal point of the lens or mirror — the point where parallel rays of light meet, or converge.

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