A lens is an object which is designed to refract the electromagnetic waves which are incident on it.  In this video, we’ll talk through the basics of convex and concave lenses before going on to get lots and lots of practice in drawing a number of ray diagrams which you’ll be expected to understand and potentially reproduce in your exam.

Key Words

magnification, lens, convex, concave, visible light, refract, refraction, light, converging, diverging, object, image, image height, object height, principal axis, principal focus, focal length, converge, diverge, real image, virtual image

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