Answer :
The laser must be pointed solely at the fish if the observer wants to zap the fish since the laser will travel through the water when its light beam is refracted.
What is used as a central idea?
Refraction is the phenomena where light bends either toward or away from the normal depending on the kind of media through which it passes. For instance, when light enters from a rarer medium into a denser medium, the light is refracted toward the normal between the two surfaces.
What is the system going through?
Due to the fact that water is a denser medium than air, when a light beam from the water enters the air, it is refracted away from the normal path, which is why an observer can perceive an apparent position for items put inside the water.
Why would a viewer want to harm a fish?
If a person were to stand on the bank of a stream and wish to spear a fish swimming in the water, they would be able to view the fish's apparent location because the fish's ray would divert away from them and they would see a slightly deeper apparent position within the fish. So that the spear may actually kill the fish, it should be pointed below the fish.
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