In this exercise about diffraction of light, we are going to describe the diffraction pattern observed on the screen, determine the expression of the linear width L of the central fringe in terms of the wavelength λ, the screen-slit distance D and the width of the slit a, and then calculate the value of a. More over, we are going to use the diffraction set-up in order to determine the diameter of a thin wire and to check whether the wire has a constant diameter. Finally, we are going to place the diffraction set-up in water in order to calculate the wavelength of the laser light in water and the refractive index of water.

You can watch:
1) Diffraction of light: [ Ссылка ]
2) Diffraction - Position of dark and bright fringes: [ Ссылка ]
3) How to calculate the diameter of a hair using laser diffraction?:
[ Ссылка ]
4) Diffraction and photoelectric effect-Lebanese official exams [GS - (2007 - 2)]:
[ Ссылка ]
5) Diffraction of light - Solved exercise: [ Ссылка ]

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