Wednesday, 8 May 2013

Lenses

Today, we learned about lenses. Lenses use refraction to change the image size. Lenses are curved and classified as either concave or convex. Convex lenses are used as magnifying glasses, while concave lenses make things smaller. Convex lenses focus light on a point called the focus.


Then, we got to play with some lenses and rayboxes. After that, we had to compare and contrast different lens types:


This work will help us with our online homework which asks us to explain how glasses are used to help people who are long-sighted.

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