- Brainpop: Vision Problems
- Frames Direct: How do glasses work?
- How stuff works: how corrective lenses work
- Virtual Lab: how are lenses used to correct vision
- PBS: How light passes through the lenses and prisms of binoculars
- Explain that stuff: How do binoculars work?
- Brainpop: Telescopes
- NASA Space Place: How telescopes ‘see’
- BBC: How do telescopes let us see so far in space?
- Brainpop: Microscopes
- PBS: Bending light with microscopes
- Explain that stuff: how does a microscope work?
- The Compound Light Microscope