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lar on the nature of light.



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corpuscular theory This theory is due to Newton (1642-1726). Light consists of tiny particles of matter emitted at high speed in a straight line luminous bodies. The direction of propagation of these particles is called a ray of light.
Newton's theory is based on these points:

rectilinear propagation. Light travels in a straight line because the corpuscles that are moving at high speed.

Reflection. is known that the light at chOcara reflected against a mirror. Newton explained this phenomenon by saying that the light particles are perfectly elastic and therefore complies with the laws of reflection of elastic collision.

Refraction. The facts that change the speed of light in media of different density, changing the direction of propagation, it is difficult to explain the particle theory. But Newton assumed that the surface separating two media of different refractive index exerted a pull on the light particles, thereby increasing the normal component of velocity

The light energy is concentrated in each particle, as in particle theory, but is spread throughout the wavefront. The wavefront is perpendicular to the directions of propagation. The wave theory explains perfectly the luminous phenomena using a geometrical construction called Huygens' principle. well according to this theory, light travels faster in less dense media. Despite this, the theory of Huygens was forgotten for a century because of the high authority of Newton.

T. In 1801 English Young gave a great impetus to the theory