Name: Diffraction Grating
Uploaded: 2019-07-19
Duration: 5 min 57 s
Description: A diffraction grating is an optical component with a periodic structure that splits and diffracts light into several beams travelling in different directions.

Question

Consider points $D$ and $E$ on the screen in Figure, where $BC = CD = DE$ . State and explain what you would expect to observe at $D$ and $E$ .

The type of interference, and hence whether a bright or a dark fringe is seen on the screen, depends on the path difference between the rays of light arriving at the screen from the double-slit.

Accepted Answer

Regions of constructive interference, corresponding to bright fringes, are produced when the path difference from the two slits to the fringe is an integral number of wavelengths of the light. Destructive interference and dark fringes are produced when the path difference is a half-integral number of wavelengths.

Dark fringe observe at point $D$ Because rays from slit $1$ and $2$ Differ in path length by one and a half wavelength $(1 \frac{1}{2} λ)$ .

Bright fringe observe at point $E$ Because the path difference is $2 λ$

David Sang and Graham Jones Solutions for Chapter: Superposition of Waves, Exercise 6: Question

David Sang Physics Solutions for Exercise - David Sang and Graham Jones Solutions for Chapter: Superposition of Waves, Exercise 6: Question

Questions from David Sang and Graham Jones Solutions for Chapter: Superposition of Waves, Exercise 6: Question with Hints & Solutions

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