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this post was submitted on 23 Apr 2024
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The reaction between a shield and laser is completely random, not knowing wether you are going to vaporise a few molecules, an entire city or everything in between makes it very unreliable for warfare purposes.
And you'd probably find the whole Landsraad against you, as using atomics is outlawed. While a bomb like that isn't an atomic weapon by definition, the effects are the same and it stands to reason that they'll therefore still retaliate in full force.
Is this mentioned in the book? I can't recall.
It is, in the opening as well as (more briefly) when Duncan leaves his shield in the desert as a booby trap for the Harkonnen search parties.
Hmm, I've taken a look and can only find references to the location being random so far. I was quite sure that I've also read that the magnitude could vary, but maybe I misremembered. I'll dig a little further and see if I can find a reference.
As far as I know it is random in the sense that the shield-lasgun interaction can either annihilate the target, the laser operator or just culminate in a giant nuclear-like explosion. Therefore you don't know whether your move will have the intended effect or whether it obliterates only yourself while the enemy is fine. I think this is mentioned early on in the first book.
The whole lasgun-shield interaction concept is one of the hand-wavy parts of Dune, kind of like the eagles in LOTR, or the ridiculously inaccurate laser blasters in Star Wars.
Shields in Dune are common defensive technology, which means that lasguns would almost certainly have to be outlawed altogether to prevent some random encounter from turning into nuclear apocalypse.
In the first movie, I think Villeneuve deals with it somewhat haphazardly. The use of a lasgun at the agricultural research station perhaps makes some sense because shields can't be used in the open desert without attracting worms. On the other hand, they show lasers being used at the first Battle of Arrakeen in close proximity to other ships that are shown to have active shields.
I remember that the location of the reaction is random and happens anywhere along the beam path. So they are safer to use at long range like from orbit as the reaction is less likely to be close to the shooter.
Yeah I always just figured the nuclear reaction would happen on the "outside" of the shield sending it in a less directional method. The shield would still fail but kinda ricochet it?