2.87 Focusing

Focusing

• We focus by changing the shape of our lens 

Distant Objects 

1. Light rays don't have to be bent that much 
2. The ciliary muscles relax 
3. Suspensory ligaments pull tight 
4. The lens is thin (pulled outwards) 

Near Objects 

1. Light rays have to be bent a lot 
2. Ciliary muscles contract 
3. Suspensory ligaments relax 
4. The lens is thick (pushed inwards)