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# Different Grating

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on In this i will experiment with the help of semi conductors laser kit and determination of wave length of laser source using grating

## Apparatus

Diode laser source grating,sample slide for pacrticle size,determination holder scale ,screen,bare.

## Theory

The diffraction of classical refers to the phenomenon wherein the waves encounter an obstacle that fragments the wave into components that interface with one another interference simply means that the wavefronts add together to make a new wave which can be significantly different than the original wave. For example a pair of sin waves having the same amplitude. But being 180 out of phase will be sum to zero. Since everywhere the one is the positive and the other is negative by an equal amount.

Although the diffraction of light waves ostensibly appears the same as the diffraction of classical waves such as water and sound waves. It is an intrinsically quantum mechanical process indeed. While diffraction of a pattern of a wave of water requires the simultaneous presence.

It is important to understand the physical process that is occurring that gives rise to the diffraction phenomenon. For the sake of concreteness, we will consider the diffraction of light through a diffraction grating which is the grating consists of transparent material into which a very large number of uniformly spaced wires have been embedded. One section of such a grating.

As the light impinges on the grating, the light waves that fall between the wires propagate straight however is absorbed or reflected backward at certain ports in the forward direction the light passing through the spaces in between the wires will be in the face and will constructively interfere. The condition for constructiveness interfere can be understood by studying whenever light passing through the diffraction in path length between the light passing through diffraction slits is an integral number of wavelengths of the incident light. The light from each of these slits will be in phase and it will form an image of the specified location mathematically.

A diffraction grating can be used to split light into its constituent wavelength. In general, it gives better wavelength intensity is usually much smaller.

By shining a light a beam into grating whose space D is known and measuring the angle where the light is imaged in which the atomic spectra of various elements were first measured.

The image created at m is called the mth order image. The visible light wavelength range by shining an incandescent light through the grating.The diffraction gratings that has 600 lines per mm. The number is a distance and it has to be converted to matters to get the wavelength in standard value.

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