When a ray of light goes through a sheet of glass, it is refracted. In certain circumstances there can be total reflection.

Un espejo esférico es una superficie reflectante que podría formarse como una sección de una esfera separada del resto por un plano. Hay dos tipos de espejos esféricos: los cóncavos y los convexos.

Una lente esférica es un cuerpo transparente formado por dos caras esféricas. Esta escena permite ver los tipos de lentes que existen.

The educational resource shows a visual about tides: the effect of the gravitational force of the moon and the sun on the earth can be seen in the tides.

Suitable lenses, correctly combined, as in the following visual can help you to understand how a telescope works.

Heisenberg showed that measuring the magnitude of a quantum particle altered its state, so that another magnitude could not be measured simultaneously

The educational resource shows a visual about the variable intensity of gravity: the intensity of gravity, g, is not a true constant, as it changes with altitude.

The educational resource shows an interactive animation about the thermometer: the fact that mercury and alcohol expand when the temperature increases is used to construct thermometers.

The cathode ray tube gave rise to an application which had an application that became very popular in the second half of the twentieth century: television.

The educational resource shows a visual about the solar system: What is at the centre, the sun or the earth? This question has been asked since the beginnings of humanity. The answer is found in the different models of the solar system.

The educational resource shows a visual about the principle of superposition: when we talk about systems with more than two bodies, we have to bear in mind the Principle of superposition of forces: the force exerted by one body on another is independent of that exerted by the rest.

The educational resource shows an interactive animation about the mechanical equivalent of heat.

The educational resource shows an interactive animation about the heating curve: when a body is heated, its temperature increases until there is a change of state; while the change takes place, the temperature remains constant.

El ODE muestra una escena interactiva donde se puede comprobar que el trabajo realizado por las fuerzas vivas (fuerza resultante ya restada la del rozamiento) que actúan sobre un sistema, es igual a su energía cinética.

Un montaje como el de la escena siguiente sirve para calcular la tensión superficial de un líquido jabonoso.

Concepto de tensión superficial

The educational resource shows an interactive animation about tempereture scales: there are various ways of expressing what the temperature of a body is. Each system is known as a temperature scale.

Telescope: optics and resolution range. Amateur astronomy is an enjoyable and educational passtime. If at any time you are able and want to get an astronomical telescope you should first find out about its possibilities.

The following visual which simulates a telescope can help you answer which telescope is better.

Telescope elements and the invention of the telescope