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[criver]

@agmik

Oh, so let me get this straight: it would have been all fine and dandy for you if there were parabolic mirrors instead of converging lenses?

It's what I've been saying for the last N comments, and what you have been arguing against - the physics explanation in the novel is pure bs.

Granted fixing it won't fix the inherent issues with isekai, the lack of tension in the battles, and the total one-sidedness of battles, but that's an entirely different
problem, and I don't even want to open that can of worms.

Also, if we are so hung up on mirrors, how exactly do you create a mirror out of just water?

You've never seen reflections on water at shallow angles? You can use Fresnel's equations to compute the exact reflectivity based on the
angle and the indices of refraction of the two media. You could also let light enter the water body, then use total internal reflection to achieve a similar effect, you
can once again compute the exact angle for this through Snell's equation.

Needless to say, finding the focus of a parabola is also trivial mathematically, and it's even more intuitive if you can actually deform it "by hand "(the "flatter" you make it
the more you move the focus away). So ideally our MC just needed a system of 2 mirrors that are large enough, the first reflecting the rays into the second, where the
second is a parabolic cylinder for example - then he'll have a whole line that will heat up to a few thousand degrees in the best case (I am not certain that it will vaporize
steel, but it should have no issue melting flesh) which he can sweep over the battlefield if he so wills. His mirrors won't vaporize either like the bs in LN, since the temperature
would only be as high in the focus, and should be normal at the mirror surface provided the focus is far enough (which follows if the parabolic cylinder is flat enough).

 

[agmik]

@criver

>It's what I've been saying for the last N comments, and what you have been arguing against - the physics explanation in the novel is pure bs.

I wasn't arguing that the explanation wasn't physically realistic. I was arguing that it doesn't need to be. Talking all that shit about speaking out of other's mouth, and yet there we are.

So, very shallow angle of reflection, isn't it, like, a very big problem? How big would the surfaces be to have enough output per sq cm, even if talking about a single ray, not a whole line.

But if you say it's real, so be it. I didn't argue against your knowledge.

What I want to know is, in what way is your system better or more realistic than converging lenses set up as an afocal system to make a ray without mirrors? Why won't it work?

 

[criver]

@agmik

I wasn't arguing that the explanation wasn't physically realistic. I was arguing that it doesn't need to be.

You had about 3 points as far as I could tell, all of which flawed.

You were either trying to pass it as plausible where you mixed in stuff that's not in the novel:

this magic actually does use some huge ass light gathering mirrors and lens systems to focus and direct large number of rays towards enemies. What you saw in these panels, small droplets, were just terminal elements for final guidance.
It doesn't take much to setup a single mirror or lens, right. It does when you need to set up the whole optical system to hit a thousand enemies per volley.

Or you were arguing that somehow there being magic in the world allows you to do any crap when it clearly states you use physics:

Right, only magic could make it work. Oh wait.

Or you tried creating imaginary plot points non-existent in the story:

Are the underlying physical laws the same?

Clearly this list is not exhaustive, but I am sure you can go through your comments to find out all of the instances.

So, very shallow angle of reflection, isn't it, like, a very big problem?

Total internal reflection for water to air is ~50 degrees angle, so not that bad. Brewster's angle is also somewhere there, so also not that terrible.
But yes, using an actual mirror would be better than using water, sure. Or anything reflective like ice/snow.

I didn't argue against your knowledge.

I'd rather you had, rather than argue that somehow fantasy or fiction should allow for bs when it doesn't follow from the premise.

What I want to know is, in what way is your system better or more realistic than converging lenses set up as an afocal system to make a ray without mirrors? Why won't it work?

You'd have a very hard time getting the same degrees (as far as I know in practice you can get a few hundred degrees with lenses, while you can easily get up to a thousand degrees with a suitable parabolic mirror). The whole droplets mirrors/concentrantors thing is also bs, since they will vaporize before the ray actually refracts (so his "remaking" those makes no sense - "water" simply won't be in liquid form at that temperature). And "my system" is really not mine, it's what's used in practice for using the sun for cooking/melting/heating etc:
https://en.wikipedia.org/wiki/Odeillo_solar_furnace

 

[agmik]

@criver

Great job finding bringing those 3 points in. Now, for how exactly they argue in favor of explanation being realistic, lets see.

The first one is the closest, even though it was in response to you saying that there was just a droplets shooting lasers. The mirrors were mentioned in WN, but not in light-gathering role, so that was my mistake. Does not change the overall point though.

The second and third ones bring up the point that it's magic in a fantasy world. Not exactly sure how you would see it as arguing in favor of explanation being physically realistic.

>You'd have a very hard time getting the same degrees

So you're saying it's it won't work because the lenses would evaporate themselves first? But that issue only affects terminal elements, which deal with concentrated beams, doesn't it. What would be the ratio between absorption and transmittance? Some quick googling gave more than 99% transmittance for certain wavelengths. But even then, idea was that terminal elements only need to transmit long enough to burn a hole and then evaporate to be recreated between volleys. Actually, weren't those terminal elements configured as mirrors? At least in WN they were.

But anyways, didn't you just say: you'd have a very hard time getting the same degrees. Oh, so it's somewhat working then. Close enough for, you know, not being a physics text book.

 

[criver]

it's magic in a fantasy world

It's physics facilitated by magic, which does not imply that you are allowed nonsense for the physics part.

So you're saying it's it won't work because the lenses would evaporate themselves first?

1) Water absorbs solar radiation quite well actually.

2) I believe that the lens that you need is actually much larger than the mirror for the same temperature (if at all feasible - I am not aware of such a lens in practice) and there are all kinds of aberrations that may arise which may make this unfeasible.

3) The main part that doesn't work is the little droplets lasers bs.

Oh, so it's somewhat working then.

What does somewhat mean in this context? Clearly some parts are pure bs (the droplets, vaporising steel), others are questionable at best (the lenses). All in all, it gets more things wrong than right, and what's described just amounts to bs.

What irks me is not so much that the author didn't do his research - it's that he tried to endow the story with authenticity and the MC with creativity through this. It's basically a very pretentious move. He should have stuck with MC wipes out the enemy army by the flick of his magical finger or something.

Basically it's trying to mask the ass pull with "physics". Might as well come out clean and show it as the ass pull it is, without being pretentious. It's just misleading.

The MC does not need any of this to win, the skillset and char is already overloaded. It's just the typical isekai with omnipotent MC, that's trying to posture as something else. I do believe works should own up to what they are, pretentious stories are one of the most irritating things: they feel like an insult to one's intelligence, aka: "the readers are too stupid so they'll gobble up this low-effort shit without complaints".

 

[wuman]

>bringing in virgin real life physics into chad imaginary written japanese comic. Mindblown.

 

[triplefff]

LET THE BODIES HIT THE FLOOR

 

[Deslin393]

Are the comments really talking physics? On a manga website...where in this particular manga magic exists??? Da fuuuh?

 

[drab_lightstick]

This is a manga. It's purely fictional. Made out of the author's imagination. Which means anything could happen; and it can defy the laws of physics... Just enjoy the manga ffs

 

[Siti]

Scifi tag? 😬

 

[overnuclear]

megidolaon!

 

[Johnson]

Did these guys seriously put physics into a completely fictional fantasy manga? Wow.

 

[AncientWatcher]

Rimuru, kill 'em all. The Farmus soldiers don't deserve mercy or restraint.

 

[Sadrobot]

Omfg I wanna see what happen next! I wanna see BLOOOD!!!

 

[tobo]

@lyndine2009
Check chapter 64, somewhere on the last pages. Shogo kills her to get her "survival" skill

 

[SirWilliam]

I thought he just moved the water droplets through the army like bullets, but then I come into the comment sections and see people talking about lasers and mirrors, were the beams not just visual effects for the reader to show how fast they moved?

Thanks @AbyssalMonkey for clearing things up for me!

 

[jaw20]

@AbyssalMonkey
Its not a water blade, it's still tons of beams of light as described in the LN, and WN.
@Seikirin
I hope you are ready to translate all newly released chapters from now on, since you made Jesterly stop translating this series.

 

[lucascba93]

Sigh, what an anticlimactic ADAPTATION.

Why did they change how Rimuru attacks the army?
They were supposed to be MARCHING not relaxing in their camp...

Did they explain why Rimuru decided to use this attack? If so I don't remember but he used it because the army had buff anti magic cast on them, also he used a barrier to prevent anyone from escaping via TP...

The beams were supposed to be straight btw (taking advantage of the army row formation while marching), not jumping everywhere like this.

Ahh, forget it, what a let down...

 

[maisonaustyn]

What in the world is this zig zaggy crap. It doesn't even look that cool visually, it just kind of looks like a mess. It almost seems like they are just gonna one and done this instead of what this was supposed to be. Sewing terror into other people contemplating invading tempest.

 

[BlueWyvern]

i thought that light that's concentrated into a beam dispersed after hitting water resulting in a rainbow?