Concept:The light-sensitive cells found in the human eye are specialised nerve cells called photoreceptors, namely rods and cones.
Explanation:The retina is the inner layer of the eye that contains light-sensitive cells, but the retina itself is not a single cell.
The cells that actually detect light are known as photoreceptor cells.
Two types of photoreceptor cells exist: rods and cones.
Rods function best in dim light and are not involved in colour vision.
Cones function best in bright light and are responsible for colour vision and sharp central vision.
The retina also contains a small area called the fovea centralis where cone cells are densely packed.
The eyes contain millions of cone cells, around
6 to
7 million, concentrated mainly at the macula.
From the given options, "cones" is the only actual type of light-sensitive cell named.
Answer:Option D. Cones.