Define centre of curvature, principal axis, optical centre, aperture,

1.	Define centre of curvature, principal axis, optical centre, aperture, focus and focal length for a lens.
Answer» (a) Centre of curvature: It is the centre of the spheres of which the each surface of the lens forms a part. Represented bv C or 2f. (b) Principal axis: An imaginary straight line passing through the two centres of curvatures. (c) Optical centre: It is the central point of the lens. Represented by O. (d) Focus: The point at which rays of light parallel to principal axis converges (convex lens) or appears to diverge (concave lens) after refraction. Represented by F. (e) Focal length: The distance between focus and optical centre is called focal length. It is represented by f.

Define centre of curvature, principal axis, optical centre, aperture, focus and focal length for a lens.

Answer»

(a) Centre of curvature: It is the centre of the spheres of which the each surface of the lens forms a part. Represented bv C or 2f.

(b) Principal axis: An imaginary straight line passing through the two centres of curvatures.

(c) Optical centre: It is the central point of the lens. Represented by O.

(d) Focus: The point at which rays of light parallel to principal axis converges (convex lens) or appears to diverge (concave lens) after refraction. Represented by F.

(e) Focal length: The distance between focus and optical centre is called focal length. It is represented by f.

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