Define principal axis of a lens.

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Solution

Principal axis or optical axis of a lens is straight line joining center of curvature of two faces with optic center of lens.

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Similar questions

Q. Define the following terms for a lens:
(a) optical centre
(b) principal axis
(c) principal focus
(d) focal length

Q. The principal axis is also called _______ of the lens.

Q. Define the principal focus of a convex lens and that of a concave lens.

Q. A point on the principal axis of a lens, to which light rays parallel to the principal axis converge after passing through the lens, is ............

A light ray passing through focus hits a convex lens. After that, it hits another lens and finally passes through the principal axis. Which kind of lens is used?
Note: Principal axis of both the lenses coincides.

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