12. Last round on lenses: water lenses in outer space

To finish with our tasks related to lenses, I would like to present a 'weird' way to demonstrate some of the propertiers of lenses. 
Astronaut Don Pettit, while on the space station, showed that you only need a drop of water and a lot of creativity to make up lenses which comply with the properties explained in optics textbooks. 

Please, watch Mr Pettit's experiment and complete the activities detailed on the worksheet that will be handed out by your teacher.
You can work in pairs and...enjoy the task!

N.B. Deadline to give in the completed task: Tuesday 17th February.

11. Defects of vision and lenses

In the following video three different defects of vision are analyzed and their correction explained.

Working in pairs, could you please make a summary of the main traits of each defect and explain its correction through lenses?