Question

what is mean by focus length​

Answer 1

Answer:

For a thin lens in air, the focal length is the distance from the center of the lens to the principal foci (or focal points) of the lens. For a converging lens (for example a convex lens), the focal length is positive, and is the distance at which a beam of collimated light will be focused to a single spot.

Answer 2

Answer:

♡Answer:

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.

\begin{gathered}\\\\\end{gathered}

< marquee > ❤♥❤ I hope you will be helped by this answer. ❤♥❤ < /marquee ><marquee> ❤♥❤Ihopeyouwillbehelpedbythisanswer.❤♥❤ </marquee>

< marquee > ♥❤♥ Please follow me and mark as brainliest. ♥❤♥ < /marquee ><marquee> ♥❤♥Pleasefollowmeandmarkasbrainliest.♥❤♥ </marquee>