In a concave lens, a ray of light emanating from the object parallel to the principal axis of the lens after refraction: (a) passes through 2F, which is the radius of curvature of the lens. (b) appears to diverge from the first principal focus. (c) emerges parallel to the principal axis. (d) passes through the second principal focus.

Answer: (b). A concave lens diverges light; a ray parallel to the axis bends away from the axis. Extended backwards, the refracted ray passes through the principal focus on the object side (called F₁ in NCERT). So the answer is (b) appears to diverge from the first principal focus.

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Spherical Surfaces & Thin Lenses

In a concave lens, a ray of light emanating from the object parallel to the principal axis of the lens after refraction:

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Answer: (b)

A concave lens diverges light; a ray parallel to the axis bends away from the axis.
Extended backwards, the refracted ray passes through the principal focus on the object side (called $F_1$ in NCERT).
So the answer is (b) appears to diverge from the first principal focus.

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