Why can you not see objects in a dim lit room when you come from a brightly lit room?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. The iris contracts the pupil to allow less light to enter the eye.
When moving from a brightly lit room to a dimly lit one, your eyes struggle to adjust due to dark adaptation. In bright light, your iris constricts your pupils to limit light intake and protect your retinas from overstimulation. As you enter a dimly lit room, your pupils need time to dilate and allow more light in.
Additionally, the light-sensitive cells in your retinas, especially the rods which function better in low light, need to become more active. This adaptation process can take several minutes, during which time your vision remains poor as your eyes adjust to the reduced lighting conditions.