Tag: effects of light

The colour of a colloidal solution depends on the wavelength of the light scattered by the dispersed particles, which in turn depends on the size and the nature of particle.
The colour of water in sea is blue on the scattering of light by water.

Dispersion optical phenomena the splitting of white light into seven constituent colors occur. These colors are often observed as light passes through a triangular prism. Upon passage through the prism, the white light is separated into its component colors - red, orange, yellow, green, blue and violet. The separation of visible light into its different colors is known as dispersion. It was mentioned in the ight and color unit that each color is characteristic of a distinct wave frequency and different frequencies of light waves will bend varying amounts upon passage through a prism. 

After scattering of light by small particles, it spreads in all directions. Hence, the intensity of the scattered light in a direction is smaller then the intensity of the incident light wave.

Tyndall Effect is observed in many natural phenomenon. It involves the scattering of light in a colloidal solution by fine particles. Some common phenomenon include the sunlight entering through forest canopy, sunlight entering a dark room from a small hole and light passed through a milk solution. Speed of light in a medium is defined by the refractive index of the medium. It is maximum for vacuum and is given by the value $3 \times 10^8\ m/s$.

The Tyndall Effect (Tyndall scattering), is light scattering by particles in a colloid or else particles in a very fine suspension. It is observed in aerosol, iris, milk, etc.

The Tyndall Effect (Tyndall scattering), is light scattering by particles in a colloid or else particles in a very fine suspension. The amount of scattering is inversely proportional to the fourth power of wavelength and hence the colour of the colloidal solution is the same as the least coloured wavelength.

After scattering, light is spread in all directions and hence the direction of propagation changes. Wavelength, speed and frequency of the light remains unchanged during the process. Also, the intensity of the light ray in a direction changes.

Scattering is the process of absorption and then re-emission of light energy by particles smaller than the wavelength of the incident light ray. 

In scattering,  light wave is absorbed and re-emitted in all directions without a change in the wavelength of the light ray.

Light of the star is bent  many times and in random directions  as light is bent when it hits a change in density. This random refraction results in the star winking out - twinkling.