Question

explain the term focus

Answer 1

focus is a point on the principal axis where all the light rays which are parallel to the principal axia meet after refraction or reflection

Answer 2

hello!!

a central point, as of attraction, attention, or activity: The need to prevent a nuclear war became the focus of all diplomatic efforts. Physics. a point at which rays of light, heat, or other radiation meet after being refracted or reflected.

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