A straight line passing through the two centres of curvature of lens is called:

Normal

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Principal axis

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Centre axis

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Diameter axis

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Solution

The correct option is A Principal axis
Principal axis is a straight line passing through the two centres of curvature of lens.

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Similar questions

A ray of light after refraction through a lens emerges parallel to the principal axis of the lens. The incident ray passes through :

(a) its optical centre

(b) its first focus

(d) the centre of curvature of the first surface.

The line joining the centre of curvature and the ___ of the mirror is called the principal Axis

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