Define
Focus & focal length ? with explanation ?
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Explanation:
The focal length of the lens is the distance between the lens and the image sensor when the subject is in focus, usually stated in millimeters (e.g., 28 mm, 50 mm, or 100 mm). ... The longer the focal length (e.g. 55 mm), the smaller the angle and the larger the subject appears to be.
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Answer :
Focus - The point on the principal axis at which the incident rays (parallel to the principal axis) meet after reflection from the mirror is called focus.
Focal length - Distance between focus and pole is focal length.
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