I'm gaming and the question of if I can see an incorporeal creature without the aid of any magical help came up. We ruled it as you can because the creature can turn incorporeal and it's only a CR 1/2.
In Pathfinder, being incorporeal has nothing to do with the Ethereal Plane, you may be thinking of how 3.5 ran incorporeal creatures and the ethereal plane.
You can see incorporeal creatures fine without magic (unless a specific incorporeal creature has wording to the contrary).
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Being incorporeal is not the same thing as being ethereal.
Incorporeal creatures are not automatically invisible. See here for the general properties of incorporeal creatures. Note that in the paragraph about how they register to the senses it does not say they are invisible:
An incorporeal creature moves silently and cannot be heard with Perception checks if it doesn’t wish to be. It has no Strength score, so its Dexterity modifier applies to its melee attacks, ranged attacks, and CMB. Nonvisual senses, such as scent and blindsight, are either ineffective or only partly effective with regard to incorporeal creatures. Incorporeal creatures have an innate sense of direction and can move at full speed even when they cannot see.
You cannot see ethereal creatures without magical help. Source:
An ethereal creature is invisible, insubstantial, and capable of moving in any direction, even up or down, albeit at half normal speed. An ethereal creature can move through solid objects, including living creatures. An ethereal creature can see and hear on the Material Plane, but everything looks gray and ephemeral. Sight and hearing onto the Material Plane are limited to 60 feet.
Force effects and abjurations affect an ethereal creature normally. Their effects extend onto the Ethereal Plane from the Material Plane, but not vice versa. An ethereal creature can't attack material creatures, and spells you cast while ethereal affect only other ethereal things. Certain material creatures or objects have attacks or effects that work on the Ethereal Plane.
An ethereal creature treats other ethereal creatures and ethereal objects as if they were material.