8/18/2019 Experimental Tools for Calculating Wavelength

http://slidepdf.com/reader/full/experimental-tools-for-calculating-wavelength 1/2

EXPERIMENTAL TOOLS FOR CALCULATING

WAVELENGTH,WAVE NUMBER,FREQUENCY AND ENERGY

OF LIGHT BEAM

By knowing the value of wavelength we can calculate wavenumber, frequency and energy easily.

1. Michelson Interferometer:

In an  Interferometer,  fringes are produced and used to make accurate measurement of wavelength.

In order to verify the wave nature of light and to measure the wavelength of light or to

observe interference of light, Michelson invented his famous interferometer in which he

divide the light from single source into two parts with the help of semi silvered glass plate.

here are some other interferometers fo calculating wavelength:

• !tatic "i#eau Interferometer 

• "abry$%&rot interferometers

'. (oung)s double slit:

homas (oung was the first who observed the interference of light in 1*+1. e placed

monochromatic source of light in front of a single slit. In order to get a coherent light he

 placed another two slits very close to each other in front of the first one. -fter passing lightrays from the two slits a pattern of alternate dark and bright fringes is formed on a screen

8/18/2019 Experimental Tools for Calculating Wavelength

http://slidepdf.com/reader/full/experimental-tools-for-calculating-wavelength 2/2

 placed parallel to slits at some distance.he central fringe was bright. "rom the interference of 

light we can easily calculate the wavelength of the light.

  . !pectrophotometry:

In  chemistry, spectrophotometry is the quantitative measurement of the reflection or transmission properties of a material as a function of wavelength. It is more specific than the

general term electromagnetic spectroscopy in that spectrophotometry deals with visible light,

near/ultraviolet, and near/infrared, but does not cover time/resolved spectroscopic techniques.