During light adaptation:

1. Rods and cones become active.
2. Rods and cones become inactive.
3. Rods become active and cones inactive.
4. Cones become active and rods inactive.

Adjusting the focal length of the eye lens to view objects at different distances is done by:

1. Cornea
2. Iris
3. Ciliary muscles
4. Sclera

Given below is a cross section of the human eye. Match the structures marked (a) to (e) with their correct functions:

Example: (f) - 6. Holds the lens in position