No fringes are seen in a single-slit diffraction pattern if ..... the distance to the screen...

No fringes are seen in a single-slit diffraction pattern if .....

the distance to the screen is greater than the slit width

the wavelength is less than the distance to the screen

the wavelength is greater than the slit width

the screen is far away

the wavelength is less than the slit width

Expert Solution

The correct option is the wavelength is greater than the slit width.

When the wavelength is greater than the slit width, there will only one big fringe. From diffraction due to a slit with width a

Sin() = m / a

where m>1 is the diffraction order. When > a, then the equation doesn't hold. Hence, there will not be any fringe.

genius_generous answered 2 years ago

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