NEET 2026 — Physics solution

NEET2026Physics

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 the second principal focus.
B
appears to diverge from the first principal focus.
C
passes through 2F, which is the radius of curvature of the lens.
D
emerges parallel to the principal axis.

Solution

For a parallel incident ray on a converging (convex) lens, the refracted ray passes through the second principal focus $F_{2}$ . For a diverging (concave) lens, the refracted ray appears to diverge from a focus on the same side as the incident light.

According to the NCERT convention, the focus on the side of the source is the first focus $F_{1}$ and on the other side is the second focus $F_{2}$ . Hence for a concave lens the parallel ray, after refraction, appears to come from $F_{2}$ (the focus on the far side).

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