The human eye is the natural convex lens that refracts light. So, it is important to know the defects of vision and which type of lens can cure which defect. World Sight Day is observed on the ...

Lenses are used in cameras, telescopes, binoculars, microscopes and corrective glasses. A lens can be convex or concave .

Learn about refraction, ray diagrams and how convex lenses bend light rays with this guide for KS3 physics students aged 11-14 from BBC Bitesize.

We compare and contrast concave and convex lenses by drawing ray diagrams. In this Closer Look segment on Lenses, we compare and contrast concave and convex lenses by drawing ray diagrams and ...