A light ray MN becomes parallel to the principal axis after passing through a concave lens. The distance OA is theof the lens.

aperture

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focal length

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radius of curvature

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Solution

The correct option is B focal length
A ray incident on the focus of a concave lens becomes parallel to the principal axis after refraction.
So, A is the focus and OA is its focal length.

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A ray starting from the focus of a concave lens becomes parallel to the principal axis after refraction.

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