Question

When sunlight passes through the window of the classroom, the path of the light is visible. What is this effect called? Give a reason.

Answer 1

Hint : In a homogeneous composition substance like glass, the path of light is straight and the velocity of light is constant. When light passes through another medium, such as air or water, its path and velocity change. As light travels from its source to your sight, its path might shift dramatically.

Complete Step By Step Answer:
The Tyndall effect, sometimes known as scattering, is the name given to this phenomenon. The light is scattered by the dust particles, making the path of the light apparent. The path of sunlight as it goes through the classroom window is evident. This is due to light scattering. This occurs when light is dispersed in the atmosphere due to dust particles. Light scattering is a type of scattering that involves the scattering of light in the form of propagating energy. The deviation of a ray from a straight path, for example, due to imperfections in the propagation medium, particles, or the interface between two media, is known as light scattering. The Tyndall effect is caused by particles in a colloid or an extremely tiny solution scattering light. It is analogous to Rayleigh scattering in that the intensity of scattered light is inversely related to the fourth power of the wavelength, therefore blue light is scattered considerably more strongly than red light. The blue colour visible in the smoke released by motorbikes, particularly two-stroke bikes, where the burning engine oil supplies these particles, is an example in everyday life.

Note :
Longer wavelengths are more transmitted by the Tyndall effect, but shorter wavelengths are more diffusely reflected via scattering. When light-scattering particulate matter is spread in an otherwise light-transmitting medium, the Tyndall effect is observed when the diameter of an individual particle is in the range of 40 to 900 nm, i.e. somewhat below or around the wavelengths of visible light (400–750 nm).