Question

Define some terms related to lenses ?​

Answer 1

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Answer 2

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Definations of some 'lens-related' terms

• Centres of Curvature: Each of the two surfaces of a spherical lens can be regarded as a part of a sphere. The centres of these two spheres, are known as the centres of curvature, of the two surfaces of the lens .

• Radii of Curvature: The radil of the two spheres, of which the lens surfaces are a part of are known as the radil of curvature of the two surfaces of the lens

• Principal Axis: The line joining the centres of curvature of the two surfaces of a lens is known as its principal axis.

• A ray of light, passing through the optical centre of a lens, goes straight through it without undergoing any bending, or deviation, from its path

• Principal Focus/Facal Length: it turns out that if a beam of rays, all parallel to the principal axis of a lens, falls on the lens, all such rays either all converge to point on its principal axis, or appear to diverge from a point on its principal as We call this point as the (second) principal focus of the lens.

The distance of the (second) principal focus from the optical centre of a lens equals the (second) focal length of the lens.

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