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The focal length is the distance from th...

The focal length is the distance from the optical centre of the lens and its principal __________ .

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To solve the question, we need to fill in the blank regarding the definition of focal length in relation to a lens. ### Step-by-Step Solution: 1. **Understanding Focal Length**: - The focal length of a lens is defined as the distance from the optical center of the lens to its principal focus. 2. **Identifying Key Terms**: ...
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