Question

24. (i) Define focal point of concave lens.
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Answer 1

Explanation:

The focal point of a concave lens is the point where light rays parallel to the axis seem to diverge from after passing through the lens. The distance from the lens to this point is called the focal length of the lens.

Answer 2

Explanation:

Focal length of concave lens is the point on the principal axis from which the ray of light initially running parallel to the principal axis seem to diverge...