Understanding Interference in Two Slit Experiments: Crests and Troughs Explained

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In a two-slit experiment, diffraction of waves results in the formation of maxima and minima on the screen. Maxima occur due to constructive interference, which can happen when either two crests or two troughs meet. The first maxima is not exclusively produced by the interference of crests, nor is the second maxima solely due to trough interference. Minima are formed at points where a crest and a trough meet, indicating destructive interference. The specific conditions of the experiment determine the nature of the interference, but the principles remain consistent.
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On a two slit experiment,the waves when diffract , on the screen maxima and minima are produced.Since both crest and trough interfere,does that mean the first maxima is produced because of the interference between two crests and the second maxima is produced because of the interference between two troughs?
 
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I believe that is correct...it is the place where a trough and a crest meet that a minima is produced..
 
It is just that whenever there is constructive interference, maxima is produced. Doesn't matter whether crests or troughs meet. That just depends on the initial conditions. So, it isn't necessary that first maxima is produced by crests etc.


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The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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