Lenses and optical instruments

Wearing glasses enables many of us to see clearly when our eyes, on their own, are unable to focus on the objects we want to see. Carol Tear looks at how optical instruments redirect light to give images of objects, which may be more accessible, clearer, larger or smaller than the original object

To understand how lenses and other optical instruments work, we do not need to decide whether to model light as a particle or a wave. We just need to know that some objects emit light, which travels directly from the source to other objects, and how it is transmitted, reflected or absorbed by those objects. This may seem obvious to you now, but most young children start with some misconceptions about how light behaves. This education article shows how some children draw the light coming from the eye to the object:

https://tinyurl.com/light-misconceptions