Human eye and the colourful world

Eye and Lens

Eye

Light , Reflection and Refraction

Refraction





When a ray of light reach the boundary between two different substances, some light is reflected, and some light is refracted. The semi-cylindrical piece of glass has a higher index of refraction.

Rainbow




Light refraction and reflection


Concave lens - physics experiment


Lens that possesses at least one surface that curves inwards. It is a diverging lens, spreading out those light rays that have been refracted through it. A concave lens is thinner at its centre than at its edges, and is used to correct short-sightedness (myopia).

Converging lenses a beginners guide for A level



Lenses

Magnetic effects

Magnetic effects



Magnetism 2


Electricity & Magnetism Hand Rules (part one)



What is the magnetic field?


Origin of Earth's Magnetic Field


Direct current electric motor