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Where does the principal axis intersect the two refracting surfaces?

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Where does the principal axis intersect the two refracting surfaces?

(a) Front vertex and back vertex

(b) Focal length

(c) Radius of curvature

(d) Principal focus

This question was posed to me in an interview.

My enquiry is from Lenses topic in section Optics of Engineering Physics II

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Correct answer is (a) Front vertex and back vertex

The best explanation: The point at which the principal axis intersects, the two refracting surfaces are front vertex and back vertex. Focal length is the distance of focal point and optical centre. The length of radius of curvature of the surface, is called radius of curvature.  The point at which converging and diverging of the rays take place is called principal focus.

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