# Diffraction?

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#### m25

##### Full Member
7+ Year Member
So I heard that diffraction through an opening is most pronounced when the wave encounters an obstacle or a slit that is comparable or smaller in size to its wavelength.
But I also heard that if the slit is smaller than the wavelength, then wavelength cannot pass through the slits anymore and diffraction will be less pronounced/will not happen.

So these two contradictory statements are confusing me. Which one is right, or am I missing some sort of big picture here?

The ideal situation is a slit of the same magnitude of the wave.

They aren't contradictory as much as they show there is an ideal range.

The ideal situation is a slit of the same magnitude of the wave.

They aren't contradictory as much as they show there is an ideal range.
What do you mean by ideal range? And what do u mean they are not contradicting?
The first statement is saying slit size =/<wave length gives most pronounced diffraction.
The second statement is saying slit size <wave length does not give pronounced diffraction since wave is too big to pass through the slit.

Where did you get the second statement from? I think it's wrong. Diffraction happens when the opening size is comparable (could be smaller) to the wavelength.

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