The eye

Figure 1 shows a cross-sectional diagram of the human eye with several structures labelled.

Figure 1: Cross-section of the human eye with labelled structures P, Q, R, S, and T

Explain how structure R controls the amount of light entering the eye when a person moves into a dimly lit room.

[2]

Figure 1 shows a cross-sectional diagram of the human eye with several structures labelled.

Figure 1: Cross-section of the human eye with labelled structures P, Q, R, S, and T

Explain how structure R controls the amount of light entering the eye when a person moves into a dimly lit room.

[2]

The eye Questions