Young's slit experiment question!!!Help me

[saltrock]

On a young's slit experiment,i found that,even at the maxima,the wave intensity was small.If i had made the slit wider to let more energy through,would the wave intensity be brighter at maxima?If not why?

[Claude Bile]

Yes, the irradiance (and the intensity) would be greater because the light is diffracting over a smaller angle.

Note that the units for intensity are W/Steradian, the units for irradiance are W/m^2. I suspect you are actually referring to irradiance.

Claude.

[saltrock]

I think if i made the slit wider,

>that means the diffraction is less
>less diffraction=less interference
>which means the intensity (brightneess)decreases.

Correct me if i am wrong please!!!

[Vector Sum]

You are sort of correct by say "diffraction is less," if you mean that the beam is less spread out. If the slit is widened, the path of the photons would become less uncertain, meaning the photon concentration that falls on the central maxima will be greater. This means greater intensity.

[Claude Bile]

What do you mean by 'less interference'?

Claude.