define principle of focus
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If you are talking about focus in observation, meditation, it is the single thing you focus on first and foremost. The focal point. The most important thing you want to put your attention on and maintain that attention when seeking to develop information or answers.
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It is a point on the principle axis of the mirror at which the light rays coming parallel to the principle axis, after the reflection actually meet, or appear to be coming from.
It is represented by F...
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