An imaginary line passing through two centres of curvatures of a lens is called:

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An imaginary line passing through two centres of curvatures of a lens is called:

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Optical axis

Principle axis

Focal axis

Vertical axis

answer is C.

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Detailed Solution

An imaginary line passing through two centres of curvatures of a lens is called the principle axis.
The centrse of curvatures, focal points and the optical centre of the lens lie on the principal axis.

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