In this video Paul Andersen explains how ray diagrams for lenses can be used to determine the size and location of a refracted image. Images may be either real or virtual images. Ray diagrams for converging and diverging lenses are...

A humorous look at the mathematics behind infinite series.

This video is the first of two lecture presentations on the structure and function of the eye. The presenter gives an overview of what the eye is and how it functions as a sensory receptor for detecting changes in light intensity. The...

This is a lecture presentation on the common problems that can affect our vision, focusing on cataracts, long-sightedness, short-sightedness, and color blindness. The presenter explains the causes, symptoms, and potential solutions for...

This is a lecture presentation on how the eye forms a clear, sharp image on the retina at the back of the eye. The lecture also explains the process by which the eye changes to focus on near and distant objects, accommodation. The...

It explains two types of spherical lenses; convex and concave lenses. It also explains technical terms related to them.It also describes the converging property of convex lens and diverging property of concave lens.

Vision defects generally come in two different ways called short sightedness and long sightedness. A person who has short sight can see near objects clearly, but struggles to focus on distant ones. This is caused by one or two reasons....

A diverging lens is sort of like the opposite of a converging lens because it curves inwards instead of outwards. It is represented with this symbol, interesting I know. Diverging lenses refract the light in a way, which makes them...