Which part of the eye contains light receptors?
A) cornea
B) iris
C) lens
D) retina
▶️ Answer/Explanation
Ans: D
The retina (D) is the light-sensitive layer at the back of the eye that contains photoreceptor cells (rods for dim light and cones for color vision).
Other parts serve different functions: the cornea (A) refracts light, the iris (B) controls pupil size, and the lens (C) focuses light. Since only the retina detects light, the correct answer is D.
Which structure focuses light on the retina?
▶️ Answer/Explanation
Ans: C
The lens is responsible for fine-tuning and focusing light precisely onto the retina. This process is called accommodation, where the lens changes shape to focus on objects at different distances.
Why not the others?
- A) Cornea – While it bends light initially, it doesn’t adjust focus like the lens.
- B) Iris – Controls pupil size to regulate light entry but doesn’t focus light.
- D) Optic nerve – Transmits visual signals to the brain but plays no role in focusing.
The lens’s ability to change curvature makes it uniquely suited for focusing light onto the retina, making C (lens) the correct answer.