Optics java applets and animations

Optics is the study of light and how it interacts with matter, and interactive simulations make its principles visible by letting a learner trace rays and waves as conditions change. Light can be treated either as rays that travel in straight lines and bend at boundaries, or as waves that interfere and diffract. Both pictures are useful, and animations help connect them to everyday phenomena such as the focusing of a lens or the colours seen in a thin film.

Ray-based simulations demonstrate reflection, where light bounces off a surface at an angle equal to the angle of incidence, and refraction, where light bends as it passes between media of different optical density. They show how lenses converge or diverge rays to form images and how mirrors do the same by reflection. A key result, total internal reflection, occurs when light inside a denser medium strikes a boundary too steeply to escape, the same effect that guides light along optical fibers.

Wave-based simulations reveal effects that the ray model cannot explain. Interference arises when two waves overlap and add or cancel, producing bright and dark bands, while diffraction shows light spreading as it passes an edge or slit. Colour is explained as the eye's response to different wavelengths, and animations can show how white light separates into a spectrum. Together these tools give an intuitive grasp of how light behaves in instruments and in nature.

Frequently asked questions

What is the difference between reflection and refraction?: Reflection is light bouncing off a surface, while refraction is light bending as it crosses between two media with different optical densities.
What causes total internal reflection?: When light inside a denser medium meets a boundary at a steep enough angle, it cannot escape and is entirely reflected back, an effect used in optical fibers.
Why do we see different colours?: Colour corresponds to different wavelengths of light; the eye and brain interpret these wavelengths as distinct colours, and white light contains a whole spectrum.

Optics: illumination:

related topic: Physics-Optics animations

CFL bulb CFL bulb, A compact fluorescent lamp (CFL), also known as a compact fluorescent light or energy saving light (or less commonly as a compact fluorescent tube [CFT]), is a type of fluorescent lamp. Many CFLs are designed to replace an incandescent lamp and can fit into most existing light fixtures formerly used for incandescents

Interactive color wheel applet wheel of saturation, intensity, and hue

Kathodenstrahlröhre-Beschleunigung

Lava Lamp Lava Lamp demonstration

Lava Lamp Lava Lamp animation

Lava Lamp

Lichtexplosie Lichtexplosie met TL buis en spaarlamp

Lichtexplosie in een microgolfoven

Light Emitting Diodes

Lightning - an example of a natural capacitor clouds and the ground can act in unison to mimic a huge natural capacitor. This tutorial shows how the collisions of dust with ionizing radiation can cause electrons to be knocked off of particles, creating a charge separation in the clouds, resulting in lightning

Relaxateur à néon en Français

Teinte Saturation Lumière

Tube fluorescent Tube fluorescent, Fluorescent lighting

Solar cell operation

related topic: Solar cells: part of physics

How PV Cells Work

MPPT A maximum power point tracker (or MPPT) is a high efficiency DC to DC converter that presents an optimal electrical load to a solar panel or array and produces a voltage suitable for the load

Photovoltaic cell animation The photovoltaic cells rely on a phenomenon called the photoelectric effect to directly convert sunlight into electricity. All light carries little bundles of energy called " photons ". When photons strike certain materials they cause it to emit electrons, Photovoltaic cell animation

Solar cell operation Photovoltaic Electricity

Solar cell operation solar cells convert light energy into electrical energy either indirectly by first converting it into heat, or through a direct process known as the photovoltaic effect. The most common types of solar cells are based on the photovoltaic effect, which occurs when light falling on a two-layer semiconductor material produces a potential difference, or voltage, between the two layers

Solar Cell Operation The following animation illustrates how a solar cell cut from a single crystal of Silicone is able to convert sunlight into electricity

Solar installations Photo Voltaic (PV) cells

Solar battery how a Solar battery works, If light hits the semiconductor to which pn is connected, the hall and the electron appear, and it becomes a battery

Solar cell animation When energy is received from the sun in the form of photons, some of the photons are absorbed near the junction, freeing the electrons and holes in the silicon. The photons of light give enough energy for the electrons to cross the junction, where they can be picked up on the metal contacts on the surface of the solar cell and move through an external circuit. After moving through the external circuit and performing work (such as powering a lamp or motor) the electrons return to the solar cell

Solar cells Photodiodes and solar cells work in the reverse sense to LEDs. If a photon of sufficient energy strikes the valence band in the transition region ( also known as the diffusion region ) of the diode, an electron can be promoted to the conduction band by the photoelectric effect leaving a hole in the valence band. The internal electric field ensures these separate and are available to an external circuit

Solar cells: animation Solar cells: animation

The Basics of a Photovoltaic Solar Cell The common solar cell that many of us have seen is called a photovoltaic solar cell

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