Answer :
The (A) lens, (B) ciliary muscle, and (D) cornea are structures involved in focusing light onto the retina in the eye.
The lens, located behind the iris, refracts light rays to focus them on the retina, which is essential for proper vision. The ciliary muscle contracts and relaxes, changing the curvature of the lens to permit accommodation and allowing the eye to focus on things at different distances.
Meanwhile, the cornea, as the eye's outermost layer, contributes to light refraction by directing light rays exactly onto the retina, which is necessary for clear and correct visual perception.
