Section-B
2. (a) Define first focus of a concave lens.
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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. ... So sunlight is a convenient source of parallel light rays. Objects that are a great distance away like hills or trees also furnish rays that are almost parallel.
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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. ... So sunlight is a convenient source of parallel light rays. Objects that are a great distance away like hills or trees also furnish rays that are almost parallel.
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