A student walks from a dimly lit cinema into a bright, sunny street.
Diagram A and Diagram B show the student's left eye under different lighting conditions.
a.[4]
Diagram B shows the student's left eye after they walk out into the bright, sunny street. Explain how you can tell this from Diagram B, and describe how the muscles in the iris bring about this change.
b.[2]
The diagrams below show how light is focused in the eyes of two students, P and Q, who have different vision defects.
Name the eye defect for each student:
- Student P
- Student Q
c.[4]
Identify the type of corrective lens needed by Student P and Student Q, and explain how each lens works to correct their vision.