WELCOME TO OUR PRESENTATION

SUBMITTED BY

Shafayat Musaddique ID#141-15-3092Farzana Pimi ID#141-15-3093

MD. Mominuz Zaman ID#141-15-3103Sharmin Sultana Jeesa ID#141-15-3219Tasniya Tabassum ID#141-15-3427

CONTENTS

Nature of light Newton’s rings Wave theory of light

NATURE OF LIGHT

Light is a kind of energy that travels in waves. Light travels very fast and in straight lines. It can travel through a vacuum and many other media. In a vacuum, the speed is a constant, c= 3×10ˆ8 m/s.

SOME CHARECTERISTICS OF LIGHT

The amplitude of a light wave is related to its intensity. The frequency of a light wave is related to its color. The wave length of a light wave is inversely proportional to its frequency. Phase difference between light waves can produces visible interference effects.

NEWTON’S RINGS

Newton's rings is a phenomenon in which an interference pattern is created by the reflection of light between two spherical surfaces—a  surface and an adjacent flat surface. It is named after Isaac Newton, who first studied them in 1717.

EQUATION OF NEWTON’S RING

where N is the bright-ring number, R is the radius of curvature of the lens the light is passing through, and λ is the wavelength of the light passing through the glass.

Emulation of Newton Rings under reflected light of different wavelength.

WAVE THEORY OF LIGHT

The wave theory, originally proposed by Robert Hooke in the 1600s, proposes that light can act as waves as opposed to particles. It claims that waves can interfere with each other as well as have additive effects. Also, different colors are different wavelengths. 

A downfall to this theory is that if it were true, light would require a medium to travel through as sound does (for example, light can travel through space, but sound cannot)

 Christiaan Huygens (1629-1695) worked out a mathematical wave theory of light in 1678, and published wave theory of light in his Treatise on light in 1690.

Huygens proposed that light was emitted in all directions as a series of waves in a medium called the Luminiferous ether. As waves are not affected by gravity, it was assumed that they slowed down upon entering a denser medium.

THOMAS YOUNG’s DOUBLE SLIT EXPERIMENT

Young's experiments supported the theory that light consists of waves.

THANK YOU

THE END