Define the following in relation with the spherical lenses.
1) Optical centre
2) Aperture (of a lens)
3) Principal focus of a convex lens
4) Focal length of a lens
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Answer:
optical mirror
Explanation:
principal focus is on the principal axis
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Answer:
1. Optical centre: A point on the axis of a lens that is so located that any ray of light passing through it in passing through the lens suffers no net deviation and that may be with in or either surface on the lens
2.Aperture: A small opening that allows light to reach a lens
3.Principal focus of a convex lens : The point on which the principal axis
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